说明

  who命令显示已经登录系统的用户，以及系统启动时间等信息

格式

  who [option]

常用参数

• -a：显示所有信息
• -b：显示系统启动时间
• -d：显示已死的进程
• -H：显示标题，默认不显示
• -l：显示登录进程

示例

[root@localhost ~]# who
root     pts/0        2018-05-14 03:05 (192.168.71.1)
root     pts/1        2018-05-14 03:45 (192.168.71.1)
root     pts/2        2018-05-14 03:45 (192.168.71.1)
[root@localhost ~]# who -a
           system boot  2018-05-11 19:17
           run-level 3  2018-05-11 19:18
LOGIN      tty1         2018-05-11 19:18              2221 id=tty1
root     + pts/0        2018-05-14 03:05   .         88743 (192.168.71.1)
root     + pts/1        2018-05-14 03:45 00:11       90858 (192.168.71.1)
root     + pts/2        2018-05-14 03:45 00:12       90892 (192.168.71.1)
           pts/3        2018-05-13 05:42             12172 id=ts/3  term=0 exit=0
           pts/4        2018-05-13 05:42             12210 id=ts/4  term=0 exit=0
           pts/5        2018-05-13 05:42             12251 id=ts/5  term=0 exit=0
           pts/6        2018-05-13 06:42             21920 id=ts/6  term=0 exit=0
           pts/7        2018-05-13 08:31             25307 id=ts/7  term=0 exit=0
[root@localhost ~]# who -b
         system boot  2018-05-11 19:17
[root@localhost ~]# who -d
         pts/3        2018-05-13 05:42             12172 id=ts/3  term=0 exit=0
         pts/4        2018-05-13 05:42             12210 id=ts/4  term=0 exit=0
         pts/5        2018-05-13 05:42             12251 id=ts/5  term=0 exit=0
         pts/6        2018-05-13 06:42             21920 id=ts/6  term=0 exit=0
         pts/7        2018-05-13 08:31             25307 id=ts/7  term=0 exit=0
[root@localhost ~]# who -H
NAME     LINE         TIME             COMMENT
root     pts/0        2018-05-14 03:05 (192.168.71.1)
root     pts/1        2018-05-14 03:45 (192.168.71.1)
root     pts/2        2018-05-14 03:45 (192.168.71.1)
[root@localhost ~]# who -l
LOGIN    tty1         2018-05-11 19:18              2221 id=tty1