Re: how to do these 2 one-liners ?

From: Junio C Hamano <junkio@cox.net>
Date: Mar 19, 2007, 22:44 UTC
Message-ID: <7vwt1cetuc.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <46d6db660703191525w613b02e1nae0f30efaca3b269@mail.gmail.com>

"Christian MICHON" <christian.michon@gmail.com> writes:

Show 6 quoted lines

> ================================================
> 1) how do I check the status of a single file ? ( the file is already
> added in the index)
>
> I usually use git-status here, but for single files that need update,
> there should be a faster way.

"git-diff-files $PATH" shows if it is different relative to the index, "git-diff-index HEAD $PATH" shows if it is different from the HEAD, and "git-diff-index --cached $PATH" shows if it is different between index and HEAD. git-status uses the first one and the third one AFAIR. You say "that need update", so probably you are interested in seeing the first one only without the third one.

If you have Git 1.5.1, then:

	if git diff-files --quiet $PATH
        then
        	echo Up to date
	else
        	echo Need update
	fi

Another more portable way is:

	if test -z "$(git diff-files --raw $PATH)"
        then
        	echo Up to date
	else
        	echo Need update
	fi

Show 6 quoted lines

> ================================================
> 2) how do I find in historical reverse order all the commits a
> certain file belongs to since the origin ?
>
> I usually do: git-log <file> | grep ^commit
> I would like to avoid piping here...

git-rev-list -m HEAD -- "$PATH"