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DESCRIPTION

Available options:

-a

Same as -bdlprTtuv.

-b

Time of last system boot.

-d

Print dead processes.

-H

Write column headings above the regular output.

-l

Print system login processes.

-m

Only print information about the current terminal. This is the POSIX way of saying who am i.

-p

Print active processes spawned by init(8).

-q

“Quick mode”: List only the names and the number of users currently logged on. When this option is used, all other options are ignored.

-r

Print the current runlevel. Supported runlevels are:

d (DEATH)

The system has halted.

s (SINGLE_USER)

The system is running in single user mode.

r (RUNCOM)

The system is executing /etc/rc.

t (READ_TTYS)

The system is processing /etc/ttys.

m (MULTI_USER)

The system is running in multi-user mode.

T (CLEAN_TTYS)

The system is in the process of stopping processes associated with terminal devices.

c (CATATONIA)

The system is in the process of shutting down and will not create new processes.

-s

List only the name, line and time fields. This is the default.

-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.

-t

Print last system clock change.

-u

Print the idle time for each user, and the associated process ID.

-v

When printing of more information is requested with -u, this switch can be used to also printed process termination signals, process exit status, session id for windowing and the type of the entry, see documentation of ut_type in getutxent(3).

am I

Returns the invoker's real user name.

file

By default, who gathers information from the file /var/run/utmpx. An alternative file may be specified which is usually /var/log/wtmpx (or /var/log/wtmp, or /var/log/wtmpx.[0-6] or /var/log/wtmp.[0-6] depending on site policy as wtmpx can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The wtmpx and wtmp file contains a record of every login, logout, crash, shutdown and date change since wtmpx and wtmp were last truncated or created.

If /var/log/wtmpx or /var/log/wtmp are 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).