cyrus-mupdatetest(1) on Linux
The text c5ea9170a3be, as Debian 10 (Buster) shipped it.
Cyrus IMAP documentation Interactive MUPDATE test program
Flags it lists
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-a -
-c -
-f -
-i -
-k -
-l -
-m -
-n -
-o -
-p -
-q -
-r -
-u -
-v -
-w