diff与patch备忘录
Created 2022-12-02 / Updated 2022-12-02生成补丁文件：
$ diff FILE1 FILE2 > PATCHFILE
应用补丁文件：
$ patch ORIGFILE PATCHFILE
撤销补丁文件：
$ patch -R FILE PATCHFILE
生成补丁文件：
$ diff FILE1 FILE2 > PATCHFILE
应用补丁文件：
$ patch ORIGFILE PATCHFILE
撤销补丁文件：
$ patch -R FILE PATCHFILE