jenkins pipeline deal with empty output from shell script

Question

In a Jenkins pipeline, I am trying to retrieve the output of a shell script into a variable.

Example

list_test = sh(script:'ls | grep test', returnStdout:true).trim() list_test.each { test -> method(test) }

This works fine as long as there is indeed an output. The problem is when the output of 'ls | grep test' is empty.

I end up with an error.

So far, the only workaround I found was:

try { list_test = sh(script:'ls | grep test', returnStdout:true).trim() } catch (Exception ex) { println("output is empty") } if (list_test) { list_test.each { test -> method(test) } }

Would there be any better way to handle that kind of issue ?

Saboteur · Accepted Answer · 2021-09-18 09:18:04Z

if grep is unable to find string, it will return non-zero exit code.

You can use something like that:

(ls|grep test)||echo "nothing found"

or you can use any command (replace 'sleep 1' with your favorite command), if you do not need any output:

(ls|grep test)||sleep 1

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