NAME
who —
display who is logged in
SYNOPSIS
who |
[am I] [file] |
DESCRIPTION
The utilitywho displays a list of all users currently
logged on, showing for each user the login name, tty name, the date and time
of login, and hostname if not local.
Available options:
- am I
- Returns the invoker's real user name.
- file
- By default,
whogathers information from the file /var/run/utmp. An alternate file may be specified which is usually /var/run/wtmp (or /var/run/wtmp.[0-6] depending on site policy as wtmp can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The wtmp file contains a record of every login, logout, crash, shutdown and date change since wtmp was last truncated or created.
If /var/log/wtmp is being used as the file, the user name may be empty or one of the special characters '|', '}' and '~'. Logouts produce an output line without any user name. For more information on the special characters, see utmp(5).
FILES
- /var/run/utmp
- /var/log/wtmp
- /var/log/wtmp.[0-6]
SEE ALSO
HISTORY
A who command appeared in
Version 6 AT&T UNIX.