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In the following code I'm trying to assign the 'ls -l /' result to the b global variable but, when I try to print what's inside it, the result is null.
How can I set a global variable?
def b = [:]
pipeline {
agent any
stages {
stage('Build') {
steps {
script{
b = sh 'ls -l /'
println "b:"+b
}
}
}
}
}
This is the result:
[Pipeline] // stage
[Pipeline] withEnv
[Pipeline] {
[Pipeline] stage
[Pipeline] { (Build)
[Pipeline] script
[Pipeline] {
[Pipeline] sh
+ ls -l /
total 24
drwxr-xr-x 2 root root 4096 Jan 18 11:49 bin
drwxr-xr-x 2 root root 6 Oct 20 10:40 boot
drwxr-xr-x 5 root root 360 Jan 21 10:00 dev
drwxr-xr-x 1 root root 77 Jan 21 10:00 etc
drwxr-xr-x 2 root root 6 Oct 20 10:40 home
drwxr-xr-x 8 root root 96 Jan 18 11:49 lib
drwxr-xr-x 2 root root 34 Jan 18 11:49 lib64
drwxr-xr-x 2 root root 6 Dec 26 00:00 media
drwxr-xr-x 2 root root 6 Dec 26 00:00 mnt
drwxr-xr-x 2 root root 6 Dec 26 00:00 opt
dr-xr-xr-x 276 root root 0 Jan 21 10:00 proc
drwx------ 1 root root 76 Feb 12 17:32 root
drwxr-xr-x 1 root root 21 Jan 21 10:00 run
drwxr-xr-x 2 root root 4096 Jan 18 11:49 sbin
drwxr-xr-x 2 root root 6 Dec 26 00:00 srv
dr-xr-xr-x 13 root root 0 Feb 6 02:34 sys
drwxrwxrwt 1 root root 4096 Feb 13 15:18 tmp
drwxr-xr-x 1 root root 32 Dec 26 00:00 usr
drwxr-xr-x 1 root root 39 Jan 21 10:00 var
[Pipeline] echo
b:null
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
Finished: SUCCESS
As you can see the b variable is always set to null.
511
On Linux, BSD, and Mac OS (Unix-like) systems, the sh step is used to execute a shell command in a Pipeline. Jenkinsfile (Declarative Pipeline) pipeline { agent any stages { stage('Build') { steps { sh 'echo "Hello World"' sh ''' echo "Multiline shell steps works too" ls -lah ''' } } } }
From within a Jenkins pipeline you can any external program. If your pipeline will run on Unix/Linux you need to use the sh command. If your pipeline will run on MS Windows you'll need to use the bat command. Naturally the commands you pass to these will also need to make sense on the specific operating system.
Setting Stage Level Environment Variable It is by using the env variable directly in the script block. We can define, let us say, USER_GROUP and display it. You will see that the underlying shell also has access to this environment variable. You can also set an environment variable using withEnv block.
If you want to capture the output of sh step correctly then you need to replace
b = sh 'ls -l /'
with
b = sh script: 'ls -l /', returnStdout: true
The default behavior of sh step is that it prints the result to the console, so if you want to change its behavior you need to explicitly set returnStdout parameter to true.
127
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