Who (Unix)

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The Unix command who displays a list of users who are currently logged into a computer. The command accepts various options that vary by system to further specify the information that is returned, such as the length of time a particular user has been connected or what pseudo-teletype a user is connected to. The who command is related to the command w, which provides the same information but also displays additional data and statistics.

Example output

The format of the output differs considerably between Unix implementations. For example:

AIX

User   tty          login@       idle      JCPU      PCPU what
root   pts/2       09:26AM          0         0         0 who

Solaris

user19    pts/35       Apr 18 08:40    (localhost)
user28    pts/27       Apr 18 09:50    (localhost)

Linux

jsmith   pts/124  Apr 11 11:04
pjones   pts/125  Apr 11 11:08

HP-UX

mjones    pts/0        Apr 18 10:01
tlin      pts/2        Apr 17 15:17

Mac OS X / Mac OS X Server

jsare     console      Apr 18 09:50
jsare     ttyp1        Apr 18 10:01
admin     ttyp2        Apr 17 15:17

Unix command line programs ( [ view] • [ talk] • [ edit] )
File and file system management:	cat \| chdir/cd \| chmod \| chown \| chgrp \| cp \| du \| df \| fdupes \| file \| fsck \| ln \| ls \| lsof \| mkdir \| more \| mount \| mv \| pwd \| rcp \| rm \| rmdir \| split \| touch \| tree
Process management:	anacron \| at \| chroot \| cron/crontab \| kill \| nice \| ps \| sleep \| time \| timex \| top \| renice \| wait
User Management/Environment:	env \| finger \| id \| locale \| mesg \| passwd \| su \| sudo \| uname \| uptime \| w \| who \| write
Text processing:	awk \| cut \| diff \| ex \| head \| iconv \| join \| less \| more \| nkf \| paste \| sed \| sort \| tail \| tr \| uniq \| wc \| xargs
Shell programming:	echo \| expr \| unset	Printing:	lp
Communications: inetd \| netstat \| ping \| rlogin \| traceroute	Searching: egrep \| fgrep \| find \| grep \| strings	Miscellaneous: banner \| bc \| cal \| man \| uname \| wall \| yes

External links

[link] The program's manpage

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Who (Unix)

Example output

See also

External links