(1)Linux提供的Shell解析器有:

[atguigu@hadoop101 ~]$ cat /etc/shells
/bin/sh
/bin/bash
/sbin/nologin
/bin/dash
/bin/tcsh
/bin/csh

(2)bash和sh的关系

[atguigu@hadoop101 bin]$ ll | grep bash
-rwxr-xr-x. root root 5月 bash
lrwxrwxrwx. root root 5月 sh -> bash

(3)Centos默认的解析器是bash

[atguigu@hadoop102 bin]$ echo $SHELL
/bin/bash
05-11 11:04