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I often find myself debugging some stuff in the installed Emacs sources, which are in *.el.gz form. And the ability to rgrep would be quite handy. Is this readily possible?

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    ag is a grep-like tool that uses libarchive for fast search inside compressed files whenever possible. The -z switch enables that behaviour and has a good deal more performance compared to zgrep, especially when used in combination with a package like helm on many small files. – wasamasa Dec 30 '14 at 23:24
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You can use the command zrgrep, which was introduced in Emacs 23.2.

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