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.