查看命令的说明 - whatis。
[root@izwz97tbgo9lkabnat2lo8z ~]# whatis ps ps (1) - report a snapshot of the current processes. [root@izwz97tbgo9lkabnat2lo8z ~]# whatis python python (1) - an interpreted, interactive, object-oriented programming language
查看帮助文档 - man / info / apropos。
[root@izwz97tbgo9lkabnat2lo8z ~]# ps --help Usage: ps [options] Try 'ps --help <simple|list|output|threads|misc|all>' or 'ps --help <s|l|o|t|m|a>' for additional help text. For more details see ps(1). [root@izwz97tbgo9lkabnat2lo8z ~]# man ps PS(1) User Commands PS(1) NAME ps - report a snapshot of the current processes. SYNOPSIS ps [options] DESCRIPTION ... [root@izwz97tbgo9lkabnat2lo8z ~]# info ps ...
切换用户 - su。
[root@izwz97tbgo9lkabnat2lo8z ~]# su hellokitty [hellokitty@izwz97tbgo9lkabnat2lo8z root]$
以管理员身份执行命令 - sudo。
[jackfrued@izwz97tbgo9lkabnat2lo8z ~]$ ls /root ls: cannot open directory /root: Permission denied [jackfrued@izwz97tbgo9lkabnat2lo8z ~]$ sudo ls /root [sudo] password for jackfrued: calendar.py code error.txt hehe hello.c index.html myconf result.txt
说明:如果希望用户能够以管理员身份执行命令,用户必须在sudoers(/etc/sudoers)名单中。
登入登出相关 - logout / exit / adduser / userdel / passwd / ssh。
[root@izwz97tbgo9lkabnat2lo8z ~]# adduser jackfrued [root@izwz97tbgo9lkabnat2lo8z ~]# passwd jackfrued Changing password for user jackfrued. New password: Retype new password: passwd: all authentication tokens updated successfully. [root@izwz97tbgo9lkabnat2lo8z ~]# ssh hellokitty@1.2.3.4 hellokitty@1.2.3.4's password: Last login: Thu Apr 12 23:05:32 2018 from 10.12.14.16 [hellokitty@izwz97tbgo9lkabnat2lo8z ~]$ logout Connection to 1.2.3.4 closed. [root@izwz97tbgo9lkabnat2lo8z ~]#