How to find what log contains a specific string?

I need to know what joblogs contain the string 'joeuser'

On *Nix you can run this command:

 grep -r joeuser /opt/skybot/server/entlogs/JobLogs/*

And on Windows you can run this command (from the C:\Program Files (x86)\Skybot\Skybot Scheduler\entlogs\JobLogs> prompt)

findstr /s /i joeuser *.*