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For example we need find fast where located and described keyword COMMIT_EDITMSG in man files. Here example howto solve it by search with command bzgrep in man files. Generally these files in bz compressed format. You can use another keywords to your search. Common syntax is:
bzgrep -lE keyword1 /usr/share/man/man?/optional-keyword-to-refine*
bzgrep -lE keyword1 /usr/share/man/man?/*
where optional-keyword-to-refine is optional and may be omitted but used to speedup search
Of course you may combine other options for bzgrep (its based on grep)
Search the pattern in bzip2 compressed file with out having to unzip.