--help is a great one. When you want to search the help output you can either feed it into grep or not... depending on whether the program writes to stdout or s

--help is a great one. When you want to search the help output you can either feed it into grep or not... depending on whether the program writes to stdout or stderr. You can force writing to stdout via adding 2>&1 at the end of your command. (It's possible that's what you're running into.)