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I've stored username and password as credentials in jenkins. Now I would like to use them in my Jenkinsfile.

I am using withCredentials DSL, however, I'm not sure how to get the username password as separate variables so I can use them in my command.

This is what I'm doing:

withCredentials([usernameColonPassword(credentialsId: 'mycreds', variable: 'MYCREDS')]) {
  sh 'cf login some.awesome.url -u <user> -p password'
How can I the username and passwork separately? I tried doing ${MYCREDS.split(":")[0]} but that doesn't seem to work. 
Here is a tiny bit simpler version of StephenKing's answer
withCredentials([usernamePassword(credentialsId: 'mycreds', usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD')]) {
  sh 'cf login some.awesome.url -u $USERNAME -p $PASSWORD'
                What is the "credentialsId" used for? In this example when and how could you use the "mycreds" variable?
– Virtual Penman
                Oct 20, 2022 at 21:49
withCredentials([[$class: 'UsernamePasswordMultiBinding', credentialsId:'mycreds',
  usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD']
So the following should work in your case:
withCredentials([[$class: 'UsernamePasswordMultiBinding', credentialsId:'mycreds', usernameVariable: 'USERNAME', passwordVariable: 'PASSWORD']]) {
  sh 'cf login some.awesome.url -u $USERNAME -p $PASSWORD'
        
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