What shell does Jenkins use?

Question

What shell is used in Jenkins when calling the shell command? I\'m running Jenkins on a Linux machine.

Answer 1

You can set the default shell using Jenkins > Manage Jenkins > Configure System > Shell executable.

For jobs that use a shell different from the default, begin the Execute shell build step with a shebang, such as:

#!/usr/bin/tcsh -e -x

command1
command2
   ...

You can even use /usr/bin/env to use, say, Python:

#!/usr/bin/env python3

Beware that a space is not allowed after the #!:

#! /usr/bin/tcsh    # Wrong

This will give the error,

java.io.IOException: Cannot run program ""

I tested the above on Jenkins 1.625.3