Linux Shell基础

Linux Shell基础

• shell类型

    [root@local ~]# cat /etc/shells
    /bin/sh
    /bin/bash
    /usr/bin/sh
    /usr/bin/bash
  

• 当前shell类型

    [root@local ~]# echo $SHELL
    /bin/bash
    [root@izuf6ee9xm7pj6aypa59cnz ~]# ps $$ 
    PID TTY      STAT   TIME COMMAND
    12100 pts/0    Ss     0:00 -bash
    [root@izuf6ee9xm7pj6aypa59cnz ~]# echo $$ 
    12100
  

  输出当前shell的进程ID
  普通用户在shell中会显示'$'
  root用户在shell中会显示'#'
  切换用户

    su user
  

  • Linux目录基本操作