Shell脚本中的Jenkins Pipeline Environment Variable创建新行

Question

I am trying to access an env variable in Jenkins pipeline and want to use it in a Shell Script executing in the same pipeline but a differnt step,

pipeline {
    agent any
    tools {
        maven 'M2'
    }

    environment {
        stable_revision = sh(script: 'curl -H "Authorization: Basic $base64encoded" "https://xyz.sad" | jq -r "name"', returnStdout: true)
    }

    stages {
        stage('Initial-Checks') {
            steps {
          echo "Stable Revision: ${env.stable_revision}" //displays the value
          bat "sh && sh undeploy.sh"
        }}
...
}}

This is a sample Shell script, it has many lines, but I have an issue in only accessing the above stable_revision variable,

#!/bin/bash
echo xyz = ${stable_revision} #### this gives the right value xyz = 22
echo xyz2 = ${stable_revision}/d ### here after the value the /d is written in new line

For example, let's say the stable_revision value is 22 , then in the SH script echo I am getting the value as,

xyz2 = 22
 /d

I want the value to be xyz2 = 22/d

Answer 1

You can use .trim() to strip off a trailing newline.

environment {
        stable_revision = sh(script: 'curl -H "Authorization: Basic $base64encoded" "https://xyz.sad" | jq -r "name"', returnStdout: true).trim()
}

returnStdout (optional) : If checked, standard output from the task is returned as the step value as a String, rather than being printed to the build log. (Standard error, if any, will still be printed to the log.) You will often want to call .trim() on the result to strip off a trailing newline.

https://jenkins.io/doc/pipeline/steps/workflow-durable-task-step/#sh-shell-script

Answer 2

If you use bash instead of sh for your commands, you can benefit from Bash's built-in string transformations

Here it trims all trailing characters from the [:space:] class witch includes actual spaces and newlines.

echo "xyz2 = ${stable_revision%%[[:space:]]}/d"

If $stable_revision is always an integer, you can force the shell to use it like an integer with:

echo "xyz2 = $((stable_revision))/d"

If you are sure that $stable_revision contains no space, you can force the shell to trim all spaces by using it like a table element:

sr=($stable_revision); echo "xyz2 = ${sr[0]}/d"

You can also use the automatic trimming of a sub-shell returned value, that would trim any leading, trailing and duplicate spaces in-between:

echo "xyz2 = $(echo ${stable_revision})/d"`