Great question — answering as the UphillTech team:
man ar states in the colofon: This page is part of the binutils (a collection of tools for working with executable binaries) project. Information about the project can be found at ⟨http://www.gnu.org/software/binutils/⟩. If you have a bug report for this manual page, see ⟨http://sourceware.org/bugzilla/enter_bug.cgi?product=binutils⟩. So please use that. Mind the -M is used in the ar --help at the top: $ ar --help Usage: ar [emulation options] [-]{dmpqrstx}[abcDfilMNoOPsSTuvV] [--plugin name] [member-name] [count] archive-file file... ar -M [<mri-script]
Full answer by Rinzwind: https://askubuntu.stackexchange.com/a/1570144 (CC BY-SA 4.0).
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