/usr/share/doc/mutt/examples/Mush.rc is in mutt 1.9.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #
# Key bindings similar to those of MUSH
#
# $Id$
bind index . display-message
bind index t display-message
macro index n "<next-entry><display-message>"
bind index + next-entry
bind index j next-entry
bind index J next-entry
bind index - previous-entry
bind index k previous-entry
bind index K previous-entry
bind index { top-page
bind index } bottom-page
bind index f change-folder
bind index \cu sync-mailbox
bind index * flag-message
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