Linux命令之who

1.who介绍

linux命令who用来显示哪些用户连接到服务器上。显示的信息包括用户名、终端、上线时间、从哪连接上来的等

2.who用法

who [参数]

who参数

参数	说明
-H	显示标题信息列
--help	在线帮助信息
--version	显示版本信息

3.实例

3.1.显示当前登录系统的用户

命令：

who

[root@rhel77 ~]# who
root     tty1         2023-07-02 15:38
root     pts/0        2023-07-02 15:39 (192.168.10.1)
[root@rhel77 ~]# 

3.2.显示当前登录系统的用户(包含标题)

命令：

who -H

[root@rhel77 ~]# who -H
NAME     LINE         TIME             COMMENT
root     tty1         2023-07-02 15:38
root     pts/0        2023-07-02 15:39 (192.168.10.1)
[root@rhel77 ~]# 

NAME：用户名

LINE：终端机信息

TIME：上线时间

COMMENT：从哪连上来的

3.3.显示帮助信息

命令：

who --help

[root@rhel77 ~]# who --help
Usage: who [OPTION]... [ FILE | ARG1 ARG2 ]
Print information about users who are currently logged in.-a, --all         same as -b -d --login -p -r -t -T -u-b, --boot        time of last system boot-d, --dead        print dead processes-H, --heading     print line of column headings-l, --login       print system login processes--lookup      attempt to canonicalize hostnames via DNS-m                only hostname and user associated with stdin-p, --process     print active processes spawned by init-q, --count       all login names and number of users logged on-r, --runlevel    print current runlevel-s, --short       print only name, line, and time (default)-t, --time        print last system clock change-T, -w, --mesg    add user's message status as +, - or ?-u, --users       list users logged in--message     same as -T--writable    same as -T--help     display this help and exit--version  output version information and exitIf FILE is not specified, use /var/run/utmp.  /var/log/wtmp as FILE is common.
If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual.GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'who invocation'
[root@rhel77 ~]# 

3.4.显示版本信息

命令：

who --version

[root@rhel77 ~]# who --version
who (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
[root@rhel77 ~]#