The initial directory for the mh-store-msg command is held in
mh-store-default-directory. Since I almost always run
mh-store-msg on sources, I set it to my personal source directory
like this:
(setq mh-store-default-directory (expand-file-name "~/src/"))
Subsequent incarnations of mh-store-msg offer the last directory
used as the default. By the way, mh-store-msg calls the Emacs
Lisp function mh-store-buffer. I mention this because you can use
it directly if you're editing a buffer that contains a file that has
been run through uuencode or shar. For example, you can
extract the contents of the current buffer in your home directory by
typing M-x mh-store-buffer RET ~ RET.
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