Git checkout next / prev commit

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Treat git log as a book, exec git next or git prev to checkout the next or the previous commit.

Please check hutusi/git-paging for updates.

	#!/bin/sh

	first() {
	branch=refs/heads/master
	git log --reverse --pretty=%H $branch \| head -1 \| xargs git checkout
	}
	first "$@"

	#!/bin/sh

	last() {
	branch=refs/heads/master
	git log --pretty=%H $branch \| head -1 \| xargs git checkout
	}
	last "$@"

	#!/bin/sh

	next() {
	branch=refs/heads/master
	if [ -z "$1" ]; then
	n=1
	else
	n=$1
	fi
	git log --reverse --pretty=%H $branch \| grep -A $n $(git rev-parse HEAD) \| tail -1 \| xargs git checkout
	}
	next "$@"