Objective

This article will provide you with the information on how to check bash version on your operating system.

Operating System and Software Versions

  • Operating System: - Distribution Agnostic

Requirements

No special prerequisites are required is required.

Difficulty

EASY

Conventions

  • # - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
  • $ - requires given linux commands to be executed as a regular non-privileged user

Instructions

Check Bash version using bash command

The easiest way to check bash version number is by executing the shell bash command with --version command option:
$ bash --version
bash --version
GNU bash, version 4.4.18(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
From the above command bash command output we ca determine that the system's bash version number is 4.4.18.

Check Bash version via builtin $BASH_VERSION variable

Another approach on how to check your shell's bash version is to print the content of shell's builtin variable $BASH_VERSION.
Example:
$ echo $BASH_VERSION
4.4.18(1)-release

Check Bash version from within shell script

Using the above builtin $BASH_VERSION variable example it is also possible to use/print bash version from within a bash shell script. Create a new new file called ~/check-bash-version.sh:
$ nano ~/check-bash-version.sh
Next, insert the following lines and save:
#!/bin/bash

echo "Checking for Bash version...."
echo "The Bash version is $BASH_VERSION !"
Once ready, make the file executable and run the script:
$ chmod +x check-bash-version.sh 
$ ./check-bash-version.sh 
Checking for Bash version....
The Bash version is 4.4.18(1)-release !
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