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(sh-utils.info)who invocation

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`who': Print who is currently logged in
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   `who' prints information about users who are currently logged on.
Synopsis:

     `who' [OPTION] [FILE] [am i]

   If given no non-option arguments, `who' prints the following
information for each user currently logged on: login name, terminal
line, login time, and remote hostname or X display.

   If given one non-option argument, `who' uses that instead of
`/var/run/utmp' as the name of the file containing the record of users
logged on.  `/var/log/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 the entry
of the user invoking it. (Equivalent to `-m'.) Traditionally, the two
arguments given are `am i', as in `who am i'.

   The program accepts the following options.  Also see Note: Common
options.

`-a'
`--all'
     Same as calling `who' with `-b -d --login -p -r -t -u'.

`-b'
`--boot'
     Print the time of the last system boot.

`-d'
`--dead'
     Print dead processes. Causes an additional field, EXIT, to be
     printed.  The EXIT field displays the termination and exit codes
     for the process.

`-H'
`--heading'
     Print a line of column headings.

`-i'
`--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.
     NOTE: `-i' is deprecated, please use -u instead.

`--login'
     Output login processes. This is equivalent to the SUS `-l' option,
     which is currently used as the shortname for `--lookup'.

`-l'
`--lookup'
     Attempt to canonicalize hostnames found in utmp through a DNS
     lookup.  This is not the default because it can cause significant
     delays on systems with automatic dial-up internet access. NOTE:
     this usage of `-l' is deprecated. (`-l' will mean `--login' in the
     next release.)

`-m'
     Output only items relating to the current terminal.

`-p'
`--process'
     Output other active processes spawned by init.

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

`-r'
`--runlevel'
     Output the current runlevel.

`-s'
`--short'
     Output only the NAME, LINE, and TIME fields. If no other options
     are selected, this is the default.

`-t'
`--time'
     Output the time of the last change to the system clock.

`--users'
`-u'
     Output the users currently logged in. Adds the IDLE field, which
     is the time since there was some activity on the user's terminal.

`-w'
`-T'
`--mesg'
`--message'
`--writable'
     After each login name print a character indicating the user's
     message status:

          `+' allowing `write' messages
          `-' disallowing `write' messages
          `?' cannot find terminal device