用shell写脚本 对比a b仓库的代码，并将a仓库所有新的改动提交至b仓库

#!/bin/bash

# 比较a和b仓库的代码
git fetch a
git fetch b
git diff a/master b/master > diff.patch

# 将a仓库新的改动提交至b仓库
git apply diff.patch
git add .
git commit -m "Merge changes from a repository"
git push b master

# 清理
rm diff.patch