Linux chsh command parameters and usage details (Linux setup System shell command)

usage rights: All users
Command: CHSH
Usage:shell>> CHSH
Description: Changing the user shell settings
Example:
Shell>> Chsh
changing fihanging shell for User1
Password: [del]
New Shell [/bin/tcsh]: # # # [is the currently used shell]
[Del]
Shell>> Chsh-l # # # show/etc/shells archive contents
/bin/bash
/bin/sh
/bin/ash
/bin/bsh
/bin/tcsh
/bin/csh

Recommended reading: Select Shell with chsh command

1 I want to know which shells are installed on my machine?
There are two ways to view:
The first type:
[Email protected] ~]$ chsh-l
/bin/sh
/bin/bash
/sbin/nologin
/bin/zsh
The second type:
[Email protected] ~]$ Cat/etc/shells
/bin/sh
/bin/bash
/sbin/nologin
/bin/zsh
In fact Chsh-l is also to view this file.
2 I want to know which shell I am currently using?
[Email protected] ~]$ echo $SHELL
/bin/bash
Note that the shell must be capitalized. As you can see, the shell I'm currently using is/bin/bash
3 After executing the zsh, I check that the current shell type is still/bin/bash?
Note that although we performed the zsh, the so-called "current Shell" is a concept of a large environment that is intended for a logged-on user. And we execute zsh just started a ZSH interpreter program, and did not change the big environment. If you want to change the "current Shell", then you still need to use CHSH.
4 I want to change my shell to zsh!.
[Email protected] ~]$ chsh-s/bin/zsh
changing shell for Rocrocket.
Password:
Shell changed.
[Email protected] ~]$
You can modify the login shell by using the CHSH plus option-s!
You will find that you are still outputting/bin/bash after performing the Echo $SHELL, because you need to restart your shell to fully engage in the zsh embrace.
5 Chsh-s exactly where was the change?
Let me tell you the secret. Chsh-s actually modifies the line that corresponds to your user name in the/etc/passwd file. Now let me look at the following:
[Email protected] ~]$ Cat/etc/passwd|grep ^rocrocket
Rocrocket:x:500:500:rocrocket,china:/rocrocket/psb/home:/bin/zsh
See! You can see that the final part of the output has become/bin/zsh! The next time you reboot, Linux will read this command to start your shell!
OK, I want to return to normal work, the shell changes will be my familiar/bin/bash!
[Email protected] ~]$ chsh-s/bin/bash
changing shell for Rocrocket.
Password:
Shell changed.

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Linux chsh command parameters and usage details (Linux setup System shell command)