源地址：https://blog.csdn.net/alloyinrunning/article/details/24171067

1、可以使用echo $SHELL来查看当前使用的shell

alloy@alloy:~echoSHELL
/bin/bash

alloy@alloy:~$ ls -al /bin/sh
lrwxrwxrwx 1 root root 4 3月 15 10:13 /bin/sh -> dash

2、通过对/etc/shells的查看可以看到当前系统中安装的shell

alloy@alloy:~$ cat /etc/shells

/etc/shells: valid login shells

/bin/sh
/bin/dash
/bin/bash
/bin/rbash

3、使用chsh可以在shell之间进行切换

alloy@raspberrypi:~/linuxshell/chapter9chsh Password: Changing the login shell for alloy Enter the new value, or press ENTER for the default Login Shell [/bin/bash]: /bin/dash alloy@raspberrypi:~/linuxshell/chapter9 echo $SHELL
/bin/bash

alloy@raspberrypi:~/linuxshell/chapter9chsh Password: Changing the login shell for alloy Enter the new value, or press ENTER for the default Login Shell [/bin/dash]: /bin/bash alloy@raspberrypi:~/linuxshell/chapter9