who(1) - NetBSD Manual Pages

WHO(1)                  NetBSD General Commands Manual                  WHO(1)


NAME
who -- display who is logged in
SYNOPSIS
who [-HmTu] [file] who am i
DESCRIPTION
The who utility 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: -H Write column headings above the regular output. -m Only print information about the current terminal. This is the POSIX way of saying who am i. -T Print a character after the user name indicating the state of the terminal line: `+' if the terminal is writable; `-' if it is not; and `?' if a bad line is encountered. -u Print the idle time for each user. am I Returns the invoker's real user name. file By default, who gathers information from the file /var/run/utmp. An alternative file may be specified which is usually /var/log/wtmp (or /var/log/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 out- put 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
last(1), mesg(1), users(1), getuid(2), utmp(5)
STANDARDS
The who utility is expected to conform to IEEE Std 1003.2-1992 (``POSIX.2'').
HISTORY
A who utility appeared in Version 6 AT&T UNIX. NetBSD 3.1.1 December 6, 1994 NetBSD 3.1.1

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