Run bash command on jenkins pipeline

The Groovy script you provided is formatting the first line as a blank line in the resultant script. The shebang, telling the script to run with /bin/bash instead of /bin/sh, needs to be on the first line of the file or it will be ignored.

So instead, you should format your Groovy like this:

stage('Setting the variables values') {    steps {         sh '''#!/bin/bash                 echo "hello world"          '''    }}

And it will execute with /bin/bash.

According to this document, you should be able to do it like so:

node {    sh "#!/bin/bash \n" +        "echo \"Hello from \$SHELL\""}

I'm sure that the above answers work perfectly. However, I had the difficulty of adding the double quotes as my bash lines where closer to 100. So, the following way helped me. (In a nutshell, no double quotes around each line of the shell)

Also, when I had "bash '''#!/bin/bash" within steps, I got the following error java.lang.NoSuchMethodError: No such DSL method '**bash**' found among steps

pipeline {    agent none    stages {        stage ('Hello') {            agent any            steps {                echo 'Hello, '                sh '''#!/bin/bash                    echo "Hello from bash"                    echo "Who I'm $SHELL"                '''            }        }    }}

The result of the above execution is