w (Unix)
命令w是许多类Unix操作系统提供的快速列出当前已登录用户信息的计算机命令。[1]该命令可以列出用户的当前动作，以及当前计算机的负载情况。该命令实际是下列多个Unix命令的组合：who，uptime和ps -a。
示例
输出示例 (内容因不同系统有很大差异)：
$ 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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