`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 the
file `/var/run/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.