man/systemctl.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU General Public License as published by
  12   the Free Software Foundation; either version 2 of the License, or
  13   (at your option) any later version.
  14
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  18   General Public License for more details.
  19
  20   You should have received a copy of the GNU General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
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  23
  24 <refentry id="systemctl">
  25
  26         <refentryinfo>
  27                 <title>systemctl</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemctl</refentrytitle>
  42                 <manvolnum>1</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemctl</refname>
  47                 <refpurpose>Control the systemd system and session manager</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <cmdsynopsis>
  52                         <command>systemctl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg> <arg choice="opt" rep="repeat">NAME</arg></command>
  53                 </cmdsynopsis>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para><command>systemctl</command> may be used to
  60                 introspect and control the state of the
  61                 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  62                 system and session manager.</para>
  63         </refsect1>
  64
  65         <refsect1>
  66                 <title>Options</title>
  67
  68                 <para>The following options are understood:</para>
  69
  70                 <variablelist>
  71                         <varlistentry>
  72                                 <term><option>--help</option></term>
  73                                 <term><option>-h</option></term>
  74
  75                                 <listitem><para>Prints a short help
  76                                 text and exits.</para></listitem>
  77                         </varlistentry>
  78
  79                         <varlistentry>
  80                                 <term><option>--type=</option></term>
  81                                 <term><option>-t</option></term>
  82
  83                                 <listitem><para>When listing units,
  84                                 limit display to certain unit
  85                                 types. If not specified units of all
  86                                 types will be shown. The argument
  87                                 should be a unit type name such as
  88                                 <option>service</option>,
  89                                 <option>socket</option> and
  90                                 similar.</para></listitem>
  91                         </varlistentry>
  92
  93                         <varlistentry>
  94                                 <term><option>--property=</option></term>
  95                                 <term><option>-p</option></term>
  96
  97                                 <listitem><para>When showing
  98                                 unit/job/manager information, limit
  99                                 display to certain properties as
 100                                 specified as argument. If not
 101                                 specified all set properties are
 102                                 shown. The argument should be a
 103                                 property name, such as
 104                                 <literal>MainPID</literal>. If
 105                                 specified more than once all
 106                                 properties with the specified names
 107                                 are shown.</para></listitem>
 108                         </varlistentry>
 109
 110                         <varlistentry>
 111                                 <term><option>--all</option></term>
 112                                 <term><option>-a</option></term>
 113
 114                                 <listitem><para>When listing units,
 115                                 show all units, regardless of their
 116                                 state, including inactive units. When
 117                                 showing unit/job/manager information,
 118                                 show all properties regardless whether
 119                                 they are set or not.</para></listitem>
 120                         </varlistentry>
 121
 122                         <varlistentry>
 123                                 <term><option>--full</option></term>
 124
 125                                 <listitem><para>Do not ellipsize unit
 126                                 names in the output of
 127                                 <command>list-units</command> and
 128                                 <command>list-jobs</command>.</para></listitem>
 129                         </varlistentry>
 130
 131                         <varlistentry>
 132                                 <term><option>--fail</option></term>
 133
 134                                 <listitem><para>If the requested
 135                                 operation conflicts with a pending
 136                                 unfinished job, fail the command. If
 137                                 this is not specified the requested
 138                                 operation will replace the pending job,
 139                                 if necessary.</para></listitem>
 140                         </varlistentry>
 141
 142                         <varlistentry>
 143                                 <term><option>--quiet</option></term>
 144                                 <term><option>-q</option></term>
 145
 146                                 <listitem><para>Suppress output to
 147                                 STDOUT in
 148                                 <command>snapshot</command>,
 149                                 <command>check</command>,
 150                                 <command>enable</command> and
 151                                 <command>disable</command>.</para></listitem>
 152                         </varlistentry>
 153
 154                         <varlistentry>
 155                                 <term><option>--no-block</option></term>
 156
 157                                 <listitem><para>Do not synchronously wait for
 158                                 the requested operation to finish. If this is
 159                                 not specified the job will be verified,
 160                                 enqueued and <command>systemctl</command> will
 161                                 wait until it is completed. By passing this
 162                                 argument it is only verified and
 163                                 enqueued.</para></listitem> </varlistentry>
 164
 165                         <varlistentry>
 166                                 <term><option>--system</option></term>
 167
 168                                 <listitem><para>Talk to the systemd
 169                                 system manager. (Default)</para></listitem>
 170                         </varlistentry>
 171
 172                         <varlistentry>
 173                                 <term><option>--session</option></term>
 174
 175                                 <listitem><para>Talk to the systemd
 176                                 session manager of the calling user.</para></listitem>
 177                         </varlistentry>
 178
 179                         <varlistentry>
 180                                 <term><option>--order</option></term>
 181                                 <term><option>--require</option></term>
 182
 183                                 <listitem><para>When used in
 184                                 conjunction with the
 185                                 <command>dot</command> command (see
 186                                 below), selects which dependencies are
 187                                 shown in the dependency graph. If
 188                                 <option>--order</option> is passed
 189                                 only dependencies of type
 190                                 <varname>After=</varname> or
 191                                 <varname>Before=</varname> are
 192                                 shown. If <option>--require</option>
 193                                 is passed only dependencies of type
 194                                 <varname>Requires=</varname>,
 195                                 <varname>RequiresOverridable=</varname>,
 196                                 <varname>Requisite=</varname>,
 197                                 <varname>RequisiteOverridable=</varname>,
 198                                 <varname>Wants=</varname> and
 199                                 <varname>Conflicts=</varname> are
 200                                 shown. If neither is passed, shows
 201                                 dependencies of all these
 202                                 types.</para></listitem>
 203                         </varlistentry>
 204
 205                         <varlistentry>
 206                                 <term><option>--no-wall</option></term>
 207
 208                                 <listitem><para>Don't send wall
 209                                 message before
 210                                 halt, power-off, reboot.</para></listitem>
 211                         </varlistentry>
 212
 213                         <varlistentry>
 214                                 <term><option>--global</option></term>
 215
 216                                 <listitem><para>When used with
 217                                 <command>enable</command> and
 218                                 <command>disable</command>, operate on the
 219                                 global session configuŕation
 220                                 directory, thus enabling or disabling
 221                                 a unit file globally for all future
 222                                 sessions of all users.</para></listitem>
 223                         </varlistentry>
 224
 225                         <varlistentry>
 226                                 <term><option>--no-reload</option></term>
 227
 228                                 <listitem><para>When used with
 229                                 <command>enable</command> and
 230                                 <command>disable</command>, do not
 231                                 implicitly reload daemon configuration
 232                                 after executing the
 233                                 changes.</para></listitem>
 234                         </varlistentry>
 235
 236                         <varlistentry>
 237                                 <term><option>--force</option></term>
 238
 239                                 <listitem><para>When used with
 240                                 <command>enable</command>, override any
 241                                 existing conflicting
 242                                 symlinks.</para></listitem>
 243                         </varlistentry>
 244
 245                         <varlistentry>
 246                                 <term><option>--defaults</option></term>
 247
 248                                 <listitem><para>When used with
 249                                 <command>disable</command>, ensures
 250                                 that only the symlinks created by
 251                                 <command>enable</command> are removed,
 252                                 not all symlinks pointing to the unit
 253                                 file that shall be
 254                                 disabled.</para></listitem>
 255                         </varlistentry>
 256                 </variablelist>
 257
 258                 <para>The following commands are understood:</para>
 259
 260                 <variablelist>
 261                         <varlistentry>
 262                                 <term><command>list-units</command></term>
 263
 264                                 <listitem><para>List known units.</para></listitem>
 265                         </varlistentry>
 266                         <varlistentry>
 267                                 <term><command>start [NAME...]</command></term>
 268
 269                                 <listitem><para>Start (activate) one
 270                                 or more units specified on the command
 271                                 line.</para></listitem>
 272                         </varlistentry>
 273                         <varlistentry>
 274                                 <term><command>stop [NAME...]</command></term>
 275
 276                                 <listitem><para>Stop (deactivate) one
 277                                 or more units specified on the command
 278                                 line.</para></listitem>
 279                         </varlistentry>
 280                         <varlistentry>
 281                                 <term><command>reload [NAME...]</command></term>
 282
 283                                 <listitem><para>Asks all units listed
 284                                 on the command line to reload their
 285                                 configuration. Note that this will
 286                                 reload the service-specific
 287                                 configuration, not the unit
 288                                 configuration file of systemd. If you
 289                                 want systemd to reload the
 290                                 configuration file of a unit use the
 291                                 <command>daemon-reload</command>
 292                                 command. In other words: for the
 293                                 example case of Apache, this will
 294                                 reload Apache's
 295                                 <filename>httpd.conf</filename> in the
 296                                 web server, not the
 297                                 <filename>apache.service</filename>
 298                                 systemd unit file. </para>
 299
 300                                 <para>This command should not be
 301                                 confused with the
 302                                 <command>daemon-reload</command> or
 303                                 <command>load</command>
 304                                 commands.</para></listitem>
 305
 306                         </varlistentry>
 307                         <varlistentry>
 308                                 <term><command>restart [NAME...]</command></term>
 309
 310                                 <listitem><para>Restart one or more
 311                                 units specified on the command
 312                                 line. If the units are not running yet
 313                                 they will be
 314                                 started.</para></listitem>
 315                         </varlistentry>
 316                         <varlistentry>
 317                                 <term><command>try-restart [NAME...]</command></term>
 318
 319                                 <listitem><para>Restart one or more
 320                                 units specified on the command
 321                                 line. If the units are not running yet
 322                                 the operation will
 323                                 fail.</para></listitem>
 324                         </varlistentry>
 325                         <varlistentry>
 326                                 <term><command>reload-or-restart [NAME...]</command></term>
 327                                 <term><command>reload-or-try-restart [NAME...]</command></term>
 328
 329                                 <listitem><para>Reload one or more
 330                                 units if they support it. If not,
 331                                 restart them instead. Note that for
 332                                 compatibility with SysV and Red Hat
 333                                 init scripts
 334                                 <command>force-reload</command> and
 335                                 <command>condrestart</command> may be
 336                                 used as equivalent commands to
 337                                 <command>reload-or-try-restart</command>.</para></listitem>
 338                         </varlistentry>
 339                         <varlistentry>
 340                                 <term><command>isolate [NAME]</command></term>
 341
 342                                 <listitem><para>Start the unit
 343                                 specified on the command line and its
 344                                 dependencies and stop all others. Note
 345                                 that this works only on units where
 346                                 <option>AllowIsolate=</option> is
 347                                 enabled. See
 348                                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 349                                 for details.</para></listitem>
 350                         </varlistentry>
 351                         <varlistentry>
 352                                 <term><command>is-active [NAME...]</command></term>
 353
 354                                 <listitem><para>Check whether any of
 355                                 the specified units is active
 356                                 (i.e. running). Returns an exit code
 357                                 0 if at least one is active, non-zero
 358                                 otherwise. Unless
 359                                 <option>--quiet</option> is specified
 360                                 this will also print the current unit
 361                                 state to STDOUT.</para></listitem>
 362                         </varlistentry>
 363                         <varlistentry>
 364                                 <term><command>status [NAME...|PID...]</command></term>
 365
 366                                 <listitem><para>Show terse runtime
 367                                 status information about one or more
 368                                 units. This function is intended to
 369                                 generate human-readable output. If you
 370                                 are looking for computer-parsable
 371                                 output, use <command>show</command>
 372                                 instead. If a PID is passed
 373                                 information about the unit the process
 374                                 of the PID belongs to is
 375                                 shown.</para></listitem>
 376                         </varlistentry>
 377                         <varlistentry>
 378                                 <term><command>show [NAME...|JOB...]</command></term>
 379
 380                                 <listitem><para>Show properties of one
 381                                 or more units, jobs or the manager
 382                                 itself. If no argument is specified
 383                                 properties of the manager will be
 384                                 shown. If a unit name is specified
 385                                 properties of the unit is shown, and
 386                                 if a job id is specified properties of
 387                                 the job is shown. By default, empty
 388                                 properties are suppressed. Use
 389                                 <option>--all</option> to show those
 390                                 too. To select specific properties to
 391                                 show use
 392                                 <option>--property=</option>. This
 393                                 command is intended to be used
 394                                 whenever computer-parsable output is
 395                                 required. Use
 396                                 <command>status</command> if you are
 397                                 looking for formatted human-readable
 398                                 output.</para></listitem>
 399                         </varlistentry>
 400
 401                         <varlistentry>
 402                                 <term><command>reset-maintenance [NAME...]</command></term>
 403
 404                                 <listitem><para>Reset maintenance
 405                                 state of the specified units, or if no
 406                                 unit name is passed of all units. When
 407                                 a unit fails in some way (i.e. process
 408                                 exiting with non-zero error code,
 409                                 terminating abnormally or timing out)
 410                                 it will automatically enter
 411                                 maintenance state and its exit codes
 412                                 and status is recorded for
 413                                 introspection by the administrator
 414                                 until the service is restarted or
 415                                 reset with this
 416                                 command.</para></listitem>
 417                         </varlistentry>
 418
 419                         <varlistentry>
 420                                 <term><command>enable [NAME...]</command></term>
 421
 422                                 <listitem><para>Enable one or more
 423                                 unit files, as specified on the
 424                                 command line. This will create a
 425                                 number of symlinks as encoded in the
 426                                 <literal>[Install]</literal> sections
 427                                 of the unit files. After the symlinks
 428                                 have been created the systemd
 429                                 configuration is reloaded (in a way
 430                                 that is equivalent to
 431                                 <command>daemon-reload</command>) to
 432                                 ensure the changes are taken into
 433                                 account immediately. Note that this
 434                                 does not have the effect that any of
 435                                 the units enabled are also started at
 436                                 the same time. If this is desired a
 437                                 seperate <command>start</command>
 438                                 command must be invoked for the
 439                                 unit.</para>
 440
 441                                 <para>This command will
 442                                 print the actions executed. This
 443                                 output may be suppressed by passing
 444                                 <option>--quiet</option>.</para>
 445
 446                                 <para>Note that this operation creates
 447                                 only the suggested symlinks for the
 448                                 units. While this command is the
 449                                 recommended way to manipulate the unit
 450                                 configuration directory, the
 451                                 administrator is free to make
 452                                 additional changes manually, by
 453                                 placing or removing symlinks in the
 454                                 directory. This is particular useful
 455                                 to create configurations that deviate
 456                                 from the suggested default
 457                                 installation. In this case the
 458                                 administrator must make sure to invoke
 459                                 <command>daemon-reload</command>
 460                                 manually as necessary, to ensure his
 461                                 changes are taken into account.</para>
 462
 463                                 <para>Enabling units should not be
 464                                 confused with starting (activating)
 465                                 units, as done by the
 466                                 <command>start</command>
 467                                 command. Enabling and starting units
 468                                 is orthogonal: units may be enabled
 469                                 without being started and started
 470                                 without being enabled. Enabling simply
 471                                 hooks the unit into various suggested
 472                                 places (for example, so that the unit
 473                                 is automatically started on boot or
 474                                 when a particular kind of hardware is
 475                                 plugged in). Starting actually spawns
 476                                 the daemon process (in case of service
 477                                 units), or binds the socket (in case
 478                                 of socket units), and so
 479                                 on.</para>
 480
 481                                 <para>Depending on whether
 482                                 <option>--system</option>,
 483                                 <option>--session</option> or
 484                                 <option>--global</option> is specified
 485                                 this enables the unit for the system,
 486                                 for sessions of the calling user only
 487                                 or for all future session of all
 488                                 users. Note that in the latter case no
 489                                 systemd daemon configuration is
 490                                 reloaded.</para>
 491                                 </listitem>
 492                         </varlistentry>
 493
 494                         <varlistentry>
 495                                 <term><command>disable [NAME...]</command></term>
 496
 497                                 <listitem><para>Disables one or more
 498                                 units. This removes all symlinks to
 499                                 the specified unit files from the unit
 500                                 configuration directory, and hence
 501                                 undoes the changes made by
 502                                 <command>enable</command>. Note
 503                                 however that this by default removes
 504                                 all symlinks to the unit files
 505                                 (i.e. including manual additions), not
 506                                 just those actually created by
 507                                 <command>enable</command>. If only the
 508                                 symlinks that are suggested by default
 509                                 shall be removed, pass
 510                                 <option>--defaults</option>. This
 511                                 implicitly reloads the systemd daemon
 512                                 configuration after completing the
 513                                 disabling of the units. Note that this
 514                                 command does not implicitly stop the
 515                                 units that is being disabled. If this
 516                                 is desired an additional
 517                                 <command>stop</command>command should
 518                                 be executed afterwards.</para>
 519
 520                                 <para>This command will print the
 521                                 actions executed. This output may be
 522                                 suppressed by passing
 523                                 <option>--quiet</option>.</para>
 524                                 </listitem>
 525
 526                                 <para>This command honours
 527                                 <option>--system</option>,
 528                                 <option>--session</option>,
 529                                 <option>--global</option> in a similar
 530                                 way as
 531                                 <command>enable</command>.</para>
 532                         </varlistentry>
 533
 534                         <varlistentry>
 535                                 <term><command>is-enabled [NAME...]</command></term>
 536
 537                                 <listitem><para>Checks whether any of
 538                                 the specified unit files is enabled
 539                                 (as with
 540                                 <command>enable</command>). Returns an
 541                                 exit code of 0 if at least one is
 542                                 enabled, non-zero
 543                                 otherwise.</para></listitem>
 544                         </varlistentry>
 545
 546                         <varlistentry>
 547                                 <term><command>load [NAME...]</command></term>
 548
 549                                 <listitem><para>Load one or more units
 550                                 specified on the command line. This
 551                                 will simply load their configuration
 552                                 from disk, but not start them. To
 553                                 start them you need to use the
 554                                 <command>start</command> command which
 555                                 will implicitly load a unit that has
 556                                 not been loaded yet. Note that systemd
 557                                 garbage collects loaded units that are
 558                                 not active or referenced by an active
 559                                 unit. This means that units loaded
 560                                 this way will usually not stay loaded
 561                                 for long. Also note that this command
 562                                 cannot be used to reload unit
 563                                 configuration. Use the
 564                                 <command>daemon-reload</command>
 565                                 command for that. All in all, this
 566                                 command is of little use except for
 567                                 debugging.</para>
 568                                 <para>This command should not be
 569                                 confused with the
 570                                 <command>daemon-reload</command> or
 571                                 <command>reload</command>
 572                                 commands.</para></listitem>
 573                         </varlistentry>
 574                         <varlistentry>
 575                                 <term><command>list-jobs</command></term>
 576
 577                                 <listitem><para>List jobs that are in progress.</para></listitem>
 578                         </varlistentry>
 579                         <varlistentry>
 580                                 <term><command>cancel [JOB...]</command></term>
 581
 582                                 <listitem><para>Cancel one or more
 583                                 jobs specified on the command line by
 584                                 their numeric job
 585                                 IDs. If not job id is specified cancels all jobs that are pending.</para></listitem>
 586                         </varlistentry>
 587                         <varlistentry>
 588                                 <term><command>monitor</command></term>
 589
 590                                 <listitem><para>Monitor unit/job
 591                                 changes. This is mostly useful for
 592                                 debugging purposes and prints a line
 593                                 each time systemd loads or unloads a
 594                                 unit configuration file, or a unit
 595                                 property changes.</para></listitem>
 596                         </varlistentry>
 597                         <varlistentry>
 598                                 <term><command>dump</command></term>
 599
 600                                 <listitem><para>Dump server
 601                                 status. This will output a (usually
 602                                 very long) human readable manager
 603                                 status dump. Its format is subject to
 604                                 change without notice and should not
 605                                 be parsed by
 606                                 applications.</para></listitem>
 607                         </varlistentry>
 608                         <varlistentry>
 609                                 <term><command>dot</command></term>
 610
 611                                 <listitem><para>Generate textual
 612                                 dependency graph description in dot
 613                                 format for further processing with the
 614                                 GraphViz
 615                                 <citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 616                                 tool. Use a command line like
 617                                 <command>systemctl dot | dot -Tsvg >
 618                                 systemd.svg</command> to generate a
 619                                 graphical dependency tree. Unless
 620                                 <option>--order</option> or
 621                                 <option>--require</option> is passed
 622                                 the generated graph will show both
 623                                 ordering and requirement
 624                                 dependencies.</para></listitem>
 625                         </varlistentry>
 626                         <varlistentry>
 627                                 <term><command>snapshot [NAME]</command></term>
 628
 629                                 <listitem><para>Create a snapshot. If
 630                                 a snapshot name is specified, the new
 631                                 snapshot will be named after it. If
 632                                 none is specified an automatic
 633                                 snapshot name is generated. In either
 634                                 case, the snapshot name used is
 635                                 printed to STDOUT, unless
 636                                 <option>--quiet</option> is
 637                                 specified.</para>
 638
 639                                 <para>A snapshot refers to a saved
 640                                 state of the systemd manager. It is
 641                                 implemented itself as unit that is
 642                                 generated dynamically with this
 643                                 command and has dependencies on all
 644                                 units active at the time. At a later
 645                                 time the user may return to this state
 646                                 by using the
 647                                 <command>isolate</command> command on
 648                                 the snapshot unit.</para></listitem>
 649
 650                                 <para>Snapshots are only useful for
 651                                 saving and restoring which units are
 652                                 running or are stopped, they do not
 653                                 save/restore any other
 654                                 state. Snapshots are dynamic and lost
 655                                 on reboot.</para>
 656                         </varlistentry>
 657                         <varlistentry>
 658                                 <term><command>delete [NAME...]</command></term>
 659
 660                                 <listitem><para>Remove a snapshot
 661                                 previously created with
 662                                 <command>snapshot</command>.</para></listitem>
 663                         </varlistentry>
 664                         <varlistentry>
 665                                 <term><command>daemon-reload</command></term>
 666
 667                                 <listitem><para>Reload systemd manager
 668                                 configuration. This will reload all
 669                                 unit files and recreate the entire
 670                                 dependency tree. While the daemon is
 671                                 reloaded, all sockets systemd listens
 672                                 on on behalf of user configuration will
 673                                 stay accessible.</para> <para>This
 674                                 command should not be confused with
 675                                 the <command>load</command> or
 676                                 <command>reload</command>
 677                                 commands.</para></listitem>
 678                         </varlistentry>
 679                         <varlistentry>
 680                                 <term><command>daemon-reexec</command></term>
 681
 682                                 <listitem><para>Reexecute the systemd
 683                                 manager. This will serialize the
 684                                 manager state, reexecute the process
 685                                 and deserialize the state again. This
 686                                 command is of little use except for
 687                                 debugging and package
 688                                 upgrades. Sometimes it might be
 689                                 helpful as a heavy-weight
 690                                 <command>daemon-reload</command>. While
 691                                 the daemon is reexecuted all sockets
 692                                 systemd listens on on behalf of user
 693                                 configuration will stay
 694                                 accessible.</para></listitem>
 695                         </varlistentry>
 696                         <varlistentry>
 697                                 <term><command>daemon-exit</command></term>
 698
 699                                 <listitem><para>Ask the systemd
 700                                 manager to quit. This is only
 701                                 supported for session managers
 702                                 (i.e. in conjunction with the
 703                                 <option>--session</option> option) and
 704                                 will fail otherwise.</para></listitem>
 705                         </varlistentry>
 706                         <varlistentry>
 707                                 <term><command>show-environment</command></term>
 708
 709                                 <listitem><para>Dump the systemd
 710                                 manager environment block. The
 711                                 environment block will be dumped in
 712                                 straight-forward form suitable for
 713                                 sourcing into a shell script. This
 714                                 environment block will be passed to
 715                                 all processes the manager
 716                                 spawns.</para></listitem>
 717                         </varlistentry>
 718                         <varlistentry>
 719                                 <term><command>set-environment [NAME=VALUE...]</command></term>
 720
 721                                 <listitem><para>Set one or more
 722                                 systemd manager environment variables,
 723                                 as specified on the command
 724                                 line.</para></listitem>
 725                         </varlistentry>
 726                         <varlistentry>
 727                                 <term><command>unset-environment [NAME...]</command></term>
 728
 729                                 <listitem><para>Unset one or more
 730                                 systemd manager environment
 731                                 variables. If only a variable name is
 732                                 specified it will be removed
 733                                 regardless of its value. If a variable
 734                                 and a value are specified the variable
 735                                 is only removed if it has the
 736                                 specified value.</para></listitem>
 737                         </varlistentry>
 738
 739                         <varlistentry>
 740                                 <term><command>halt</command></term>
 741
 742                                 <listitem><para>Shut down and halt the
 743                                 system. This is mostly equivalent to
 744                                 <command>start halt.target</command>
 745                                 but also prints a wall message to all
 746                                 users.</para></listitem>
 747                         </varlistentry>
 748                         <varlistentry>
 749                                 <term><command>poweroff</command></term>
 750
 751                                 <listitem><para>Shut down and
 752                                 power-off the system. This is mostly
 753                                 equivalent to <command>start
 754                                 poweroff.target</command> but also
 755                                 prints a wall message to all
 756                                 users.</para></listitem>
 757                         </varlistentry>
 758                         <varlistentry>
 759                                 <term><command>reboot</command></term>
 760
 761                                 <listitem><para>Shut down and
 762                                 reboot the system. This is mostly
 763                                 equivalent to <command>start
 764                                 reboot.target</command> but also
 765                                 prints a wall message to all
 766                                 users.</para></listitem>
 767                         </varlistentry>
 768                         <varlistentry>
 769                                 <term><command>default</command></term>
 770
 771                                 <listitem><para>Enter default
 772                                 mode. This is mostly equivalent to
 773                                 <command>start
 774                                 default.target</command>.</para></listitem>
 775                         </varlistentry>
 776                         <varlistentry>
 777                                 <term><command>rescue</command></term>
 778
 779                                 <listitem><para>Enter rescue
 780                                 mode. This is mostly equivalent to
 781                                 <command>isolate
 782                                 rescue.target</command> but also
 783                                 prints a wall message to all
 784                                 users.</para></listitem>
 785                         </varlistentry>
 786                         <varlistentry>
 787                                 <term><command>emergency</command></term>
 788
 789                                 <listitem><para>Enter emergency
 790                                 mode. This is mostly equivalent to
 791                                 <command>isolate
 792                                 emergency.target</command> but also
 793                                 prints a wall message to all
 794                                 users.</para></listitem>
 795                         </varlistentry>
 796                 </variablelist>
 797
 798         </refsect1>
 799
 800         <refsect1>
 801                 <title>Exit status</title>
 802
 803                 <para>On success 0 is returned, a non-zero failure
 804                 code otherwise.</para>
 805         </refsect1>
 806
 807         <refsect1>
 808                 <title>See Also</title>
 809                 <para>
 810                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 811                         <citerefentry><refentrytitle>systemadm</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 812                         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 813                         <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 814                         <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
 815                 </para>
 816         </refsect1>
 817
 818 </refentry>