Edit → Find Usages… allows you to locate usages of the current declaration. This is useful to find out where a function is called or where a variable is referenced in the scripts of your project.
BashSupport Pro contains stub files with all predefined variables of Bash and POSIX shells.
For example, it’s possible to locate all usages of
$HOME inside your project. Simply place your cursor on a reference to
$HOME and invoke the Find Usages… action.