(coreutils.info)users invocation

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20.5 `users': Print login names of users currently logged in
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`users' prints on a single line a blank-separated list of user names of
users currently logged in to the current host.  Each user name
corresponds to a login session, so if a user has more than one login
session, that user's name will appear the same number of times in the
output.  Synopsis:

     users [FILE]

   With no FILE argument, `users' extracts its information from a
system-maintained file (often `/var/run/utmp' or `/etc/utmp').  If a
file argument is given, `users' uses that file instead.  A common
choice is `/var/log/wtmp'.

   The only options are `--help' and `--version'.  Note: Common
options.

   An exit status of zero indicates success, and a nonzero value
indicates failure.