who(1)

     NAME
          who - show who is logged on

     SYNOPSIS
          who [-imqsuwHT] [--count] [--idle] [--heading] [--help]
          [--message] [--mesg] [--version] [--writable] [file] [am i]

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of who.  If given
          no non-option arguments, who prints the following
          information for each user currently logged on:

               login name
               terminal line
               login time
               remote hostname or X display

          If given one non-option argument, who uses that instead of
          /etc/utmp as the name of the file containing the record of
          users logged on.  /etc/wtmp is commonly given as an argument
          to who to look at who has previously logged on.

          If given two non-option arguments, who prints only the entry
          for the user running it (determined from its standard
          input), preceded by the hostname.  Traditionally, the two
          arguments given are `am i', as in `who am i'.

        OPTIONS
          -m   Same as `who am i'.

          -q, --count
               Print only the login names and the number of users
               logged on.  Overrides all other options.

          -s   Ignored; for compatibility with other versions of who.

          -i, -u, --idle
               After the login time, print the number of hours and
               minutes that the user has been idle.  `.' means the
               user was active in last minute.  `old' means the user
               was idle for more than 24 hours.

          -H, --heading
               Print a line of column headings.

          -w, -T, --mesg, --message, --writable
               Like -s, plus after the login name print a character
               indicating the user's message status:
               +    allowing write messages

               -    disallowing write messages

               ?    cannot find terminal device

          --help
               Print a usage message on standard output and exit
               successfully.

          --version
               Print version information on standard output then exit
               successfully.