WHO(1)                               BSD                                WHO(1)



NAME
     who - who is on the system

SYNOPSIS
     who [ -w ] [ -a | -d | -f nodefile | -n arg] [ who-file ]
     who [ am i ]

DESCRIPTION
     who, without any options or arguments, lists the log-in name, terminal
     name, and log-in time for each user currently logged in.

     Without an argument, who examines the /etc/utmp file to obtain its
     information.  If you specify a file, that file is used instead of
     /etc/utmp.  Typically the specified file is /usr/adm/wtmp, which contains
     a record of all the logins since it was created.  Then who lists logins,
     logouts, and crashes since the creation of the wtmp file.  Each login is
     listed with username, terminal name (with /dev/ suppressed), and date and
     time.  When an argument is given, logouts produce a similar line without
     a username.  Reboots produce a line with x in place of the device name,
     and a fossil time indicative of when the system went down.

     who am i (or who with two arguments) tells who you are logged in as.

Domain/OS BSD OPTIONS
     -w        Produces wide output.  Normally, lines are printed with the
               name and node fields 20 characters wide.  The -w option prints
               the maximum name and node field widths.

     -a        Processes /etc/utmp or the named file for all nodes in the
               ring.

     -d        Displays information about all nodes booted off the current
               boot volume.  This can be useful for listing users who should
               be notified of an impending system shutdown.

     -f nodefile
               Specifies nodes for which /etc/utmp will be processed.
               nodefile should contain lines in the form: //nodename or
               [net.]nodeid, one per line.  A pound sign (#) in the first
               column causes that line to be treated as a comment.

     -n arg1[,arg2...]
               Specifies nodes for which /etc/utmp will be processed.  The arg
               lists the nodes to be processed, and should be in the form:
               //nodename or [net.]nodeid.  If more than one node is
               specified, they should be either separated by commas or
               separated by whitespace, and the entire argument should be in
               quotes.

     You can use only one of -a, -d, -f, or -n.

WARNINGS
     /etc/utmp can be an unreliable source of login information.  /etc/utmp is
     written by the most recently executed /bin/login, which is not
     necessarily the same as the current login.  whoami does not read
     /etc/utmp, and is a more accurate method for getting the current user id.

FILES
     /etc/utmp

SEE ALSO

     last(1), whoami(1), getuid(2), getpwent(3), utmp(5)