Linux 下查看系统当前登录用户信息

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  • 当你新登录一个主机,过着管理一个主机,这时候你就需要这些命令来进行...~
  • 保持更新,转载请注明出处~
  • 当你新登录一个主机,过着管理一个主机,这时候你就需要这些命令来进行...~

当你新登录一个主机,过着管理一个主机,这时候你就需要这些命令来进行查看了:

1. w : Show who is logged on and what they are doing.

    w [options] user […]

常用命令:

    w -h –no-header

    w -u –no-current

    w -s :   Use the short format.  Don’t print the login time, JCPU or PCPU times.

    w -i, –ip-addr : Display IP address instead of hostname for from field.

2. who : Show who is logged on

   who -a, –all 展示所有的; 相当于 使用 -b -d –login -p -r -t -T -u

3. users: Print the user names of users currently logged in to the current host

4. whoami : Print effective userid

    Print the user name associated with the current effective user ID.  Same as id -un.

5. last : last, lastb – show a listing of last logged in users

    last -a 

    last [options] [username…] [tty…]

last  searches  back  through the /var/log/wtmp file (or the file designated by the -f option) and displays a list of all users logged in
(and out) since that file was created. One or more usernames and/or ttys can be given, in which case last will show only the entries
matching those arguments. Names of ttys can be abbreviated, thus last 0 is the same as last tty0.

When catching a SIGINT signal (generated by the interrupt key, usually control-C) or a SIGQUIT signal, last will show how far it has
searched through the file; in the case of the SIGINT signal last will then terminate.

The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all the reboots since the log file
was created.

lastb is the same as last, except that by default it shows a log of the /var/log/btmp file, which contains all the bad login attempts.

 last reboot 展示所有的机器重新启动的情况。

6. lastb:lastb is the same as last, except that by default it shows a log of the /var/log/btmp file, which contains all the bad login attempts.

    在root 权限下,使用 lastb 命令,将会显示所有尝试登录失败的情况。

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