Get before/after files from specified commit-id.

get_before_and_after_from_git_commitid.sh

#!/bin/bash
if [ -z $1 ]; then
    echo "Need commitid."
    exit -1
fi
FILES=`git diff-tree --no-commit-id --name-only -r $1`

OUTPUT='/tmp/git-diff'
mkdir -p $OUTPUT
mkdir -p $OUTPUT/before
mkdir -p $OUTPUT/after
for FILE in $FILES; do
    NEW_FILENAME=`basename $FILE`
    git show $1~1:$FILE > $OUTPUT/before/$NEW_FILENAME
    git show $1:$FILE > $OUTPUT/after/$NEW_FILENAME
done
7za a -r ~/tmp/$1.7z $OUTPUT/*
rm -rf $OUTPUT
echo "done".