+# The command (which will be run with sh -c) must at least create
+# the new account's home directory. The passwd and group entries
+# will not have been set up. The following environment variables
+# will be set, giving details about the account to be created:
+# SYNCACCOUNT_CREATE_USER
+# SYNCACCOUNT_CREATE_UID
+# SYNCACCOUNT_CREATE_GID
+# SYNCACCOUNT_CREATE_COMMENT
+# SYNCACCOUNT_CREATE_HOME
+# SYNCACCOUNT_CREATE_SHELL
+# If it chooses, the script may modify the password entry which
+# will be added to the system, by outputting a replacement
+# password file entry. (The password field of that is ignored.)
+# If the script outputs a line which does not contain a : then
+# the account will not be created after all.
+#