W (Unix)
The command w on many Unix-like
A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification....

 operating system
Operating system
An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...

s provides a quick summary of every user logged into a computer, what that user is currently doing, and what load
Load (computing)
In UNIX computing, the system load is a measure of the amount of work that a computer system performs. The load average represents the average system load over a period of time...

 all the activity is imposing on the computer itself. The command is a one-command combination of several other Unix programs: who
Who (Unix)
The standard Unix command who displays a list of users who are currently logged into a computer.The who command is related to the command w, which provides the same information but also displays additional data and statistics.- Specification :...

, uptime
Uptime is a measure of the time a machine has been up without any downtime.It is often used as a measure of computer operating system reliability or stability, in that this time represents the time a computer can be left unattended without crashing, or needing to be rebooted for administrative or...

, and ps -a
Ps (Unix)
In most Unix-like operating systems, the ps program displays the currently-running processes. A related Unix utility named top provides a real-time view of the running processes....


Sample output (this may 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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