who - Print information about users who are currently logged
in.
who [-a|--all] [-b|--boot]
[-d|--dead] [-H|--heading]
[-l|--login] [--lookup] [-m ]
[-p|--process] [-q|--count]
[-r|--runlevel] [-s|--short]
[-t|--time] [-u|--users]
[-T|--mesg] [-h|--help]
[-V|--version] [FILE]
Print information about users who are currently logged in.
- -a, --all
- same as -b -d --login -p -r -t -T -u
- -b, --boot
- time of last system boot
- -d, --dead
- print dead processes
- -H, --heading
- print line of column headings
- -l, --login
- print system login processes
- --lookup
- attempt to canonicalize hostnames via DNS
- -m
- only hostname and user associated with stdin
- -p, --process
- print active processes spawned by init
- -q, --count
- all login names and number of users logged on
- -r,
--runlevel
- print current runlevel
- -s, --short
- print only name, line, and time (default)
- -t, --time
- print last system clock change
- -u, --users
- list users logged in
- -T, --mesg
- add user's message status as +, - or ?
- -h, --help
- Print help
- -V, --version
- Print version
- [FILE]
-