diff和patch的使用

1) diff/patch這對工具在數學上來說，diff是對2個集合求差，patch是求和

diff A B > C 生成A和B的diff文件C

patch A C 給A打上diff文件得到B

patch -R B C B還原為A

2) 內核補丁

生成

diff -uNr linux-2.6.xxx linux-2.6.xxx.1 > diff.patch

升級

cp diff.patch linux-2.6.xxx/.

cd linux-2.6.xxx

patch -p1 diff.patch

可以參考$(linux_src)/Documentation/applying_patches.txt