I take it you are asking about the -a argument for commit.
"git commit --help" says:
-a, --all
Tell the command to automatically stage files that have been
modified and deleted, but new files you have not told git about are not
affected.
This is basically the same as first running "git add -u" before a git
commit. From "git add --help":
-u, --update
Only match <filepattern> against already tracked files in the
index rather than the working tree. That means that it will never stage new
files, but that it will stage
modified new contents of tracked files and that it will remove
files from the index if the corresponding files in the working tree have
been removed.
git commit -a is a very practical shortcut, usually if you've just done a
just few changes in your working tree, and you want to commit them all
without having to "git add" first.
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