How can I find my shell version using a Linux command?

Question

I would like to know about my shell version using a Linux command. I tried the following command, but it shows the type of the shell I am in.

Command:

ec         


        

Answer 1

It depends on whether you want to know the version of your default login shell, or the version of the shell you're currently running. They're not necessarily the same.

For your default login shell, as the accepted answer says, $SHELL --version is likely to work. Most (but not all) shells accept a --version option. (dash does not.) And this assumes that the value of $SHELL hasn't been changed (there can be valid reasons to do so).

For the shell you're currently running, if it happens to be bash you can type:

echo $BASH_VERSION

For tcsh:

echo $version

For zsh:

echo $ZSH_VERSION
echo $ZSH_PATCHLEVEL # shows more detailed information

For ksh:

echo $KSH_VERSION

For fish:

echo $version

Again, this assumes that the relevant variable hasn't been modified (there's rarely any non-malicious reason to change it).

Bash in particular has an array variable $BASH_VERSINFO that gives more information in a form that's easier to process programmatically. Printing $BASH_VERSINFO only prints the first element; to print all elements:

echo "${BASH_VERSINFO[@]}"