way to automatically add untracked files?

[Miles Bader <miles@gnu.org>]

One thing I often want to do is git-add all untracked files, and also
automatically git-rm all "disappeared" files (I keep my .gitignore files
well maintained, so the list of adding/missing files shown by git status
is almost always correct).  At the same time, I usually want to do "git
add -u" to git-add modified files.

One way to do this seems to be just "git add .", but I'm always slightly
nervous using it because it sits there and churns the disk for an awful
long time (whereas "git status" is instantaneous).  Is this the right
thing to do?  Is there something funny causing the churning?

Thanks,

-Miles

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