Jenkins

import com.cloudbees.plugins.credentials.SystemCredentialsProvider;
import org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl

println "Jenkins credentials config file location=" +
SystemCredentialsProvider.getConfigFile();
println ""

SystemCredentialsProvider.getInstance().getCredentials().stream().
  filter { cred -> cred instanceof StringCredentialsImpl }.
  forEach { cred ->
    println "secret text=" + cred.getId() + ":"+ cred.getSecret().getPlainText()
  }