The command w on many Unix-like operating systems provides a quick summary of every user logged into a computer, what that user is currently doing, and what load all the activity is imposing on the computer itself. The command is a one-command combination of several other Unix programs: who, uptime, and ps -a. Sample output (this will, of course, vary between systems):
$ w 11:12am up 608 day(s), 19:56, 6 users, load average: 0.36, 0.36, 0.37 User tty login@ idle what smithj pts/5 8:52am w jonesm pts/23 20Apr06 28 -bash harry pts/18 9:01am 9 pine peterb pts/19 21Apr06 emacs -nw html/index.html janetmcq pts/8 10:12am 3days -csh singh pts/12 16Apr06 5:29 /usr/bin/perl -w perl/test/program.pl
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| File and file system management | alias · cat · chattr · cd · chmod · chown · chgrp · cksum · cmp · cp · du · df · file · fsck · fuser · ln · ls · lsattr · lsof · mkdir · mount · mv · pwd · rm · rmdir · split · touch |
| Process management | at · chroot · crontab · exit · kill · killall · nice · pgrep · pidof · pkill · ps · pstree · sleep · time · top · wait · watch |
| User management/environment | env · finger · id · logname · mesg · passwd · su · sudo · uname · uptime · w · wall · who · whoami · write |
| Text processing | awk · comm · cut · ed · ex · fmt · head · iconv · join · less · more · paste · sed · sort · tac · tail · tr · uniq · wc · xargs |
| Shell programming | basename · echo · expr · false · printf · test · true · unset |
| Printing: lp · Communications: inetd · netstat · ping · rlogin · nc · traceroute · Searching: find · grep · strings · Miscellaneous: banner · bc · cal · dd · man · size · yes | |
