3 VERSION='@(#)tzselect.ksh 8.2'
4 PKGVERSION='@PKGVERSION@'
5 REPORT_BUGS_TO='@REPORT_BUGS_TO@'
7 # Ask the user about the time zone, and output the resulting TZ value to stdout.
8 # Interact with the user via stderr and stdin.
10 # Contributed by Paul Eggert.
14 # This script requires several features of the Korn shell.
15 # If your host lacks the Korn shell,
16 # you can use either of the following free programs instead:
18 # <a href=ftp://ftp.gnu.org/pub/gnu/>
19 # Bourne-Again shell (bash)
22 # <a href=ftp://ftp.cs.mun.ca/pub/pdksh/pdksh.tar.gz>
26 # This script also uses several features of modern awk programs.
27 # If your host lacks awk, or has an old awk that does not conform to Posix.2,
28 # you can use either of the following free programs instead:
30 # <a href=ftp://ftp.gnu.org/pub/gnu/>
34 # <a href=ftp://ftp.whidbey.net/pub/brennan/>
39 # Specify default values for environment variables if they are unset.
43 # Check for awk Posix compliance.
44 ($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
46 echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible."
50 if [ "$1" = "--help" ]; then
53 Select a time zone interactively.
55 For bug reporting instructions, please see:
59 elif [ "$1" = "--version" ]; then
61 tzselect $PKGVERSION$VERSION
66 # Make sure the tables are readable.
67 TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
68 TZ_ZONE_TABLE=$TZDIR/zone.tab
69 for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
72 echo >&2 "$0: time zone files are not set up correctly"
82 # Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout.
83 case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in
88 # Begin the main loop. We come back here if the user wants to retry.
91 echo >&2 'Please identify a location' \
92 'so that time zone rules can be set correctly.'
99 # Ask the user for continent or ocean.
101 echo >&2 'Please select a continent or ocean.'
103 select continent in \
114 'none - I want to specify the time zone using the Posix TZ format.'
118 echo >&2 'Please enter a number in range.';;
121 Americas) continent=America;;
122 *' '*) continent=$(expr "$continent" : '\([^ ]*\)')
131 # Ask the user for a Posix TZ string. Check that it conforms.
133 echo >&2 'Please enter the desired value' \
134 'of the TZ environment variable.'
135 echo >&2 'For example, GST-10 is a zone named GST' \
136 'that is 10 hours ahead (east) of UTC.'
138 $AWK -v TZ="$TZ" 'BEGIN {
139 tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+"
140 time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?"
141 offset = "[-+]?" time
142 date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)"
143 datetime = "," date "(/" time ")?"
144 tzpattern = "^(:.*|" tzname offset "(" tzname \
145 "(" offset ")?(" datetime datetime ")?)?)$"
146 if (TZ ~ tzpattern) exit 1
150 echo >&2 "\`$TZ' is not a conforming" \
151 'Posix time zone string.'
155 # Get list of names of countries in the continent or ocean.
156 countries=$($AWK -F'\t' \
157 -v continent="$continent" \
158 -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
161 $3 ~ ("^" continent "/") {
162 if (!cc_seen[$1]++) cc_list[++ccs] = $1
165 while (getline <TZ_COUNTRY_TABLE) {
166 if ($0 !~ /^#/) cc_name[$1] = $2
168 for (i = 1; i <= ccs; i++) {
170 if (cc_name[country]) {
171 country = cc_name[country]
176 ' <$TZ_ZONE_TABLE | sort -f)
179 # If there's more than one country, ask the user which one.
182 echo >&2 'Please select a country.'
183 select country in $countries
186 '') echo >&2 'Please enter a number in range.';;
199 # Get list of names of time zone rule regions in the country.
200 regions=$($AWK -F'\t' \
201 -v country="$country" \
202 -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
206 while (getline <TZ_COUNTRY_TABLE) {
207 if ($0 !~ /^#/ && country == $2) {
213 $1 == cc { print $4 }
217 # If there's more than one region, ask the user which one.
220 echo >&2 'Please select one of the following' \
222 select region in $regions
225 '') echo >&2 'Please enter a number in range.';;
236 # Determine TZ from country and region.
238 -v country="$country" \
239 -v region="$region" \
240 -v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
244 while (getline <TZ_COUNTRY_TABLE) {
245 if ($0 !~ /^#/ && country == $2) {
251 $1 == cc && $4 == region { print $3 }
254 # Make sure the corresponding zoneinfo file exists.
255 TZ_for_date=$TZDIR/$TZ
257 echo >&2 "$0: time zone files are not set up correctly"
263 # Use the proposed TZ to output the current date relative to UTC.
264 # Loop until they agree in seconds.
265 # Give up after 8 unsuccessful tries.
268 for i in 1 2 3 4 5 6 7 8
270 TZdate=$(LANG=C TZ="$TZ_for_date" date)
271 UTdate=$(LANG=C TZ=UTC0 date)
272 TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)')
273 UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)')
277 Local time is now: $TZdate.
278 Universal Time is now: $UTdate."
284 # Output TZ info and ask the user to confirm.
287 echo >&2 "The following information has been given:"
289 case $country+$region in
290 ?*+?*) echo >&2 " $country$newline $region";;
291 ?*+) echo >&2 " $country";;
292 +) echo >&2 " TZ='$TZ'"
295 echo >&2 "Therefore TZ='$TZ' will be used.$extra_info"
296 echo >&2 "Is the above information OK?"
302 '') echo >&2 'Please enter 1 for Yes, or 2 for No.';;
314 *csh) file=.login line="setenv TZ '$TZ'";;
315 *) file=.profile line="TZ='$TZ'; export TZ"
319 You can make this change permanent for yourself by appending the line
321 to the file '$file' in your home directory; then log out and log in again.
323 Here is that TZ value again, this time on standard output so that you
324 can use the $0 command in shell scripts:"