coreutils: users invocation

1 
1 20.5 ‘users’: Print login names of users currently logged in
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1 
1 ‘users’ prints on a single line a blank-separated list of user names of
1 users currently logged in to the current host.  Each user name
1 corresponds to a login session, so if a user has more than one login
1 session, that user’s name will appear the same number of times in the
1 output.  Synopsis:
1 
1      users [FILE]
1 
1    With no FILE argument, ‘users’ extracts its information from a
1 system-maintained file (often ‘/var/run/utmp’ or ‘/etc/utmp’).  If a
1 file argument is given, ‘users’ uses that file instead.  A common choice
1 is ‘/var/log/wtmp’.
1 
11    The only options are ‘--help’ and ‘--version’.  ⇒Common
 options.
1 
1    The ‘users’ command is installed only on platforms with the POSIX
1 ‘<utmpx.h>’ include file or equivalent, so portable scripts should not
1 rely on its existence on non-POSIX platforms.
1 
1    An exit status of zero indicates success, and a nonzero value
1 indicates failure.
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