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Well, the files in /proc are generally not real files. Most of them are just an interface to statistics and information about your computer. So trying to run grep on some of them may cause problems.
Keep in mind that running this command on *everything* in your entire filesystem is not the greatest idea. Not only is it going to take forever, it doesn't make any sense to search /proc or /dev for matching words. It'd be better to run find several times, on say:
find /usr ...
And so on. And keep in mind what a poster in your previous thread said, that doing it this way starts a new process for fgrep every time a file is found (which is *many* times), making it even slower.