Help with Jenkinsfile script syntax error please

[ZillaYT]

I have the following code to try to get a docker image

stage("Cache ECS Image") {
 image = sh(returnStdout: true, script: 'docker image ls | grep ${env.DBName} | tr -s \" \" | cut -d \" \" -f3').trim()
 echo "Image ID: $image"
 echo "Image ID: ${image}"
 // some other code follow
}

..and get the following error.

11:32:23 /home/jenkins/workspace/PRM - ChrisF Pipeline@tmp/durable-bcbc328d/script.sh: 2: /home/jenkins/workspace/PRM - ChrisF Pipeline@tmp/durable-bcbc328d/script.sh: Bad substitution 11:32:23 + tr -s
11:32:23 + cut -d -f3
[Pipeline] echo
11:32:23 Image ID:
[Pipeline] echo
11:32:23 Image ID:

What is my syntax error?

[John Mellor]

Is that going to work? You are trying to expand a groovy variable ${env.DBName} inside single quotes. I think you need to either use triple double-quotes, or switch the double quotes and the single quotes. IMHO, this kind of construct is used often, but is very hard to do correctly in groovy pipelines.

[ZillaYT]

John, see my header please. ;-)

[ZillaYT]

Using double quotes and escaping the internal double quotes was the trick. so this works...

stage("Cache ECS Image") {
 image = sh(returnStdout: true, script: "docker image ls | grep ${env.DBName} | tr -s \" \" | cut -d \" \" -f3").trim()
 echo "Image ID: $image"

 // some other code follow
}

I get a valid value for the ImageID.

[DmitryB]

[ZillaYT]

Thanks, that works too