Hey Rob,

Using find is probably your best bet. If you are wanting to parse all files in a directory called somedir, you can:

$ find /path/to/somedir -type f -exec grep blue {} \;

Find is an extremely useful command, you can specify multiple files, access time, modification time etc. etc. The man page is worth a read. The -exec executes the next command and places the argument (in this case the file it found) to the right of the {}. Using exec rather than xargs keeps you to fewer sys calls.

Hope this helps.

Cheers,
Keith