"Choose shell with Chsh"-linux command five-minute series 12

The CHSH command is used to modify your login shell.

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.

over~

Chsh-l may not be available under Ubuntu

Operation Result:

Man out of the Chsh

Have-l option not known why not available

"Choose shell with Chsh"-linux command five-minute series 12