grep/file masks

This is because grep does not do its own file-filtering but relies entirely on the command line environment to translate file-mask specifications into a list of files, which are then each passed to grep as a separate argument. This is a feature/defect of bash and possibly most other Linux command shells (investigation needed).

In short, grep does not have the ability to search recursively using a file-mask, and any mask entered:

• will apply only to the current folder
• will prevent grep from recursively searching any folders whose names do not also match