顯示當前誰在登錄中
2、命令格式
who [OPTION]... [ FILE | ARG1 ARG2 ]
3、常用命令參數
打印當前正在登錄用戶的信息
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[zhang@zhang ~]$ who
root tty1 2015-12-20 09:12
oldboy pts/0 2015-12-20 09:13 (192.168.0.7)
oldboy pts/1 2015-12-20 09:13 (192.168.0.7)
oldboy pts/2 2015-12-20 09:13 (192.168.0.7)
-a, --all 等同於 -b -d --login -p -r -t -T -u
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[oldboy@zhang ~]$ who -a
system boot 2015-12-20 09:10
run-level 3 2015-12-20 09:10
root + tty1 2015-12-20 09:12 00:40 1201
LOGIN tty2 2015-12-20 09:10 1203 id=2
LOGIN tty3 2015-12-20 09:10 1205 id=3