One killer feature of any IDE is the ability to jump to a symbol definition in a different file. Sadly, this feature is not always available out of the box (Looking at you Sublime!). Until that day, here's a simple grep I use often to find function definitions or calls.
grep -nr awesome() .
This will search for all occurrences of
awesome() in your app and includes the line number with the
-n flag. The
-r flag ensures recursively traversing your folders.
--color flag if your terminal isn't already showing colors :)