mboxgrep(1) on Linux
The text d81885c6af19, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
displays email messages matching a pattern
Flags it lists
-
--basic-regexp -
--body -
--count -
--delete -
--extended-regexp -
--file-lock -
--headers -
--help -
--ignore-case -
--invert-match -
--mailbox-format -
--no-duplicates -
--no-file-lock -
--output -
--perl-regexp -
--pipe -
--recursive -
--regexp -
--version -
-B -
-E -
-G -
-H -
-P -
-V -
-c -
-d -
-e -
-h -
-i -
-l -
-m -
-nd -
-nl -
-o -
-p -
-r -
-v