NAME

who − who is logged in on the system

SYNOPSIS

who [ who-file ] [ am i ]

DESCRIPTION

Used without arguments, who lists the login name, terminal name, and login time for each current UNIX user.  who gets this information from the /etc/utmp file. 

If a filename argument is given, the named file is examined instead of /etc/utmp.  Typically the named file is /usr/adm/wtmp, which contains a record of all logins since it was created.  In this case, who lists logins, logouts, and crashes.  Each login is listed with user name, terminal name (with ‘/dev/’ suppressed), and date and time.  Logouts produce a similar line without a user name.  Reboots produce a line with ‘~’ in place of the device name, and a fossil time indicating when the system went down.  Finally, the adjacent pair of entries ‘|’ and ‘}’ indicate the system-maintained time just before and after a date command changed the system’s idea of the time. 

With two arguments, as in ‘who am i’ (and also ‘who is who’), who tells who you are logged in as:  it displays your hostname, login name, terminal name, and login time. 

EXAMPLES

angel% who am i
angel!henryttyp0Apr 27 11:24
angel%

krypton% who
mktg  ttym0Apr 27 11:11
shannon  ttyp0Apr 27 11:25
henry  ttyp1Apr 27 11:30
krypton%

FILES

/etc/utmp /usr/adm/wtmp

SEE ALSO

whoami(1), wtmp(5), w(1)

Sun Release 3.5  —  Last change: 23 September 1985