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This article mainly explains "how to check what kind of shell is used under Linux". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to check which kind of shell is used under Linux".

View the shell available for the current release

The code is as follows:

[root@localhost ~] $cat / etc/shells

/ bin/sh

/ bin/bash

/ sbin/nologin

View the shell method currently in use

First, the most commonly used command to view shell, but can not reflect the current shell in real time

The code is as follows:

[root@localhost ~] $echo $SHELL

/ bin/bash

The following usage is not supported by all shell

The code is as follows:

[root@localhost ~] $echo $0

-bash

Third, the matching search of shell in environment variables

The code is as follows:

[root@localhost ~] $env | grep SHELL

SHELL=/bin/bash

4. Matching search of shell in password file

The code is as follows:

[root@localhost ~] $cat / etc/passwd | grep root

Root:x:0:0:root:/root:/bin/bash

View the current process

The code is as follows:

[root@localhost ~] $ps

PID TTY TIME CMD

3052 pts/0 00:00:00 bash

3254 pts/0 00:00:00 ps

6. Check the pid of the current shell before navigating to the shell process

The code is as follows:

[root@localhost ~] $echo $$

1862

[root@localhost ~] $ps-ef | grep 1862

Root 1862 1860 0 01:50 pts/0 00:00:00-bash

Root 2029 1862 0 02:07 pts/0 00:00:00 ps-ef

Root 2030 1862 0 02:07 pts/0 00:00:00 grep 1862

7. Enter a command that does not exist to view the shell prompt for errors

The code is as follows:

[root@localhost ~] $asdf

Bash: asdf: command not found

Attachment: it can be realized with one command:

The code is as follows:

[root@localhost ~] $ps-ef | grep `echo $$`| grep-v grep | grep-v ps

Root 1862 1860 0 01:50 pts/0 00:00:00-bash

Thank you for your reading, the above is the content of "how to check which kind of shell is used under Linux". After the study of this article, I believe you have a deeper understanding of how to check which kind of shell is used under Linux. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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