Run bash command on jenkins pipeline

Question

Inside a groovy script (for a jenkins pipeline): How can I run a bash command instead of a sh command?

I have tried the following:

Call "#!/bin/bash" inside the sh call:

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

Replace the sh call with a bash call:

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

Additional Info:

My command is more complex than a echo hello world.

Solution 1

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.

Solution 2

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

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

Solution 3

For multi-line shell scripts or those run multiple times, I would create a new bash script file (starting from #!/bin/bash), and simply run it with sh from Jenkinsfile:

sh 'chmod +x ./script.sh'
sh './script.sh'

Solution 4

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

Solution 5

If you want to change your default shell to bash for all projects on Jenkins, you can do so in the Jenkins config through the web portal:

Manage Jenkins > Configure System (Skip this clicking if you want by just going to https://{YOUR_JENKINS_URL}/configure.)

Fill in the field marked 'Shell executable' with the value /bin/bash and click 'Save'.

View more solutions

Comments

[Yago Azedias]

The logo returns a error for the "+" WorkflowScript: 9: illegal string body character after dollar sign; solution: either escape a literal dollar sign "\$5" or bracket the value expression "${5}" @ line 9, column 68. 2c-437a-b8a2-db013fe42f62\"" +

[Jacob]

Can you please post the script? From what you've pasted, it looks like there are two quotes before the +, which is wrong.

[Yago Azedias]

Have you test it? I made with a way that I set to run a file inside my git repository, with this I have sure that the code will be exec as bash code, instead a shell code.

[Jake]

Yes, it successfully worked for me. I had a script that used bash specific syntax which was failing until I formatted it so the first line was not blank.

[DenCowboy]

@Jake Any idea how you gen use a bash-specific script in a stage? This part works for me too, but when I try to trigger a bash script it does not work for me.

[forzagreen]

Not all Jenkins versions support bash step. However sh '''#!/bin/bash ... should also work.

[Marcello Romani]

java.lang.NoSuchMethodError: No such DSL method 'bash' found among steps

[Anuradha Fernando]

Thank you @Jacob I was having the same problem and your comment helped me to solve those!

[Isaac Freeman]

Don't use "\n" and "+", just use tripple quotes to do a multi-line string.

[mirekphd]

For multi-line scripts or those run multiple times, I would create a new bash script file (starting from #!/bin/bash), and simply run it with: chmod +x './script.sh' && sh './script.sh'

[red888]

You can also just use newline in the same string: sh '#!/bin/bash\n echo "$SHELL"'