How can I write agent linux?

Hi!
I have this pipeline:

pipeline{
    agent { label: "linux"}
    options{ 
        buildDiscarder logRotator (artifactDaysToKeepStr: '', artifactNumToKeepStr:'5',daysToKeepStr: '',numToKeepStr: '5')
        disableConcurrentBuilds()
    }
    stages{ 
        stage('Hello'){
             steps{
                 echo 'Hello'
             }
        }
    }

}

and I got this error:

WorkflowScript: 2: Expected an agent @ line 2, column 5.
agent { label: “linux”}
^

WorkflowScript: 2: No agent type specified. Must be one of [any, label, none] @ line 2, column 5.
agent { label: “linux”}
^

2 errors

at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:309)

If anyone knows what the problem is-
itll help me a lot
thanks
Frida

Hello @Frida and welcome to this community :wave:

Please have a look at the documentation Gavin provided, and let us know if that works for you.