Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

who(1) [freebsd man page]

WHO(1)							    BSD General Commands Manual 						    WHO(1)

NAME
who -- display who is on the system SYNOPSIS
who [-abHmqsTu] [am I] [file] DESCRIPTION
The who utility displays information about currently logged in users. By default, this includes the login name, tty name, date and time of login and remote hostname if not local. The options are as follows: -a Equivalent to -bTu, with the exception that output is not restricted to the time and date of the last system reboot. -b Write the time and date of the last system reboot. -H Write column headings above the output. -m Show information about the terminal attached to standard input only. -q ``Quick mode'': List the names and number of logged in users in columns. All other command line options are ignored. -s Show the name, line and time fields only. This is the default. -T Indicate whether each user is accepting messages. One of the following characters is written: + User is accepting messages. - User is not accepting messages. ? An error occurred. -u Show idle time for each user in hours and minutes as hh:mm, '.' if the user has been idle less than a minute, and ``old'' if the user has been idle more than 24 hours. am I Equivalent to -m. By default, who gathers information from the file /var/run/utx.active. An alternate file may be specified which is usually /var/log/utx.log (or /var/log/utx.log.[0-6] depending on site policy as utx.log can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The utx.log file contains a record of every login, logout, crash, shutdown and date change since utx.log was last truncated or created. If /var/log/utx.log 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 getutxent(3). ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_TIME environment variables affect the execution of who as described in environ(7). FILES
/var/run/utx.active /var/log/utx.log /var/log/utx.log.[0-6] EXIT STATUS
The who utility exits 0 on success, and >0 if an error occurs. SEE ALSO
last(1), users(1), w(1), getutxent(3) STANDARDS
The who utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
A who command appeared in Version 1 AT&T UNIX. BSD
February 11, 2012 BSD

Check Out this Related Man Page

LAST(1) 						    BSD General Commands Manual 						   LAST(1)

NAME
last -- indicate last logins of users and ttys SYNOPSIS
last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host] [-n maxrec] [-t tty] [user ...] DESCRIPTION
The last utility will either list the sessions of specified users, ttys, and hosts, in reverse time order, or list the users logged in at a specified date and time. Each line of output contains the user name, the tty from which the session was conducted, any hostname, the start and stop times for the session, and the duration of the session. If the session is still continuing or was cut short by a crash or shutdown, last will so indicate. The following options are available: -d date Specify the snapshot date and time. All users logged in at the snapshot date and time will be reported. This may be used with the -f option to derive the results from stored utx.log files. When this argument is provided, all other options except for -f and -n are ignored. The argument should be in the form [[CC]YY][MMDD]hhmm[.SS] where each pair of letters represents the follow- ing: CC The first two digits of the year (the century). YY The second two digits of the year. If YY is specified, but CC is not, a value for YY between 69 and 99 results in a CC value of 19. Otherwise, a CC value of 20 is used. MM Month of the year, from 1 to 12. DD Day of the month, from 1 to 31. hh Hour of the day, from 0 to 23. mm Minute of the hour, from 0 to 59. SS Second of the minute, from 0 to 61. If the CC and YY letter pairs are not specified, the values default to the current year. If the SS letter pair is not specified, the value defaults to 0. -f file Read the file file instead of the default, /var/log/utx.log. -h host Host names may be names or internet numbers. -n maxrec Limit the report to maxrec lines. -s Report the duration of the login session in seconds, instead of the default days, hours and minutes. -t tty Specify the tty. Tty names may be given fully or abbreviated, for example, ``last -t 03'' is equivalent to ``last -t tty03''. -w Widen the duration field to show seconds, as well as the default days, hours and minutes. -y Report the year in the session start time. If multiple arguments are given, and a snapshot time is not specified, the information which applies to any of the arguments is printed, e.g., ``last root -t console'' would list all of ``root's'' sessions as well as all sessions on the console terminal. If no users, hostnames or terminals are specified, last prints a record of all logins and logouts. The pseudo-user reboot logs in at reboots of the system, thus ``last reboot'' will give an indication of mean time between reboot. If last is interrupted, it indicates to what date the search has progressed. If interrupted with a quit signal last indicates how far the search has progressed and then continues. FILES
/var/log/utx.log login data base SEE ALSO
lastcomm(1), getutxent(3), ac(8), lastlogin(8) HISTORY
A last utility appeared in 3.0BSD. BUGS
If a login shell should terminate abnormally for some reason, it is likely that a logout record will not be written to the utx.log file. In this case, last will indicate the logout time as "shutdown". BSD
January 21, 2010 BSD
Man Page