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Code Block
import java.util.logging.ConsoleHandler
import java.util.logging.FileHandler
import java.util.logging.SimpleFormatter
import java.util.logging.LogManager
import jenkins.model.Jenkins

// Log into the console
def loggerWebAppMainLogger = LogManager.getLogManager().getLogger("hudson.WebAppMain")
loggerWebAppMainLogger.addHandler (new ConsoleHandler())

// Log into a file
def RunLogger = LogManager.getLogManager().getLogger("hudson.model.Run")
def logsDir = new File(Jenkins.instance.rootDir, "logs")
FileHandler handler = new FileHandler(logsDir.absolutePath+"/hudson.model.Run-%g.log", 1024 * 1024, 10, true);
handler.setFormatter(new SimpleFormatter());

This will just copy all log records generated by Jenkins and any plugins to the console and all logs from hudson.model.Run into a file. They will still be available in the log view in the web UI.

Of course, you can edit the Groovy script to add other or more handlers, set their levels, etc. Just refer to the java.util.logging documentation.

A much simpler solution (though with no configurability) is to install the Support Core plugin, which causes custom logs to be written to disk automatically.