一. 针对单文件的patch:

我们以mkprj.sh.1和mkprj.sh两个文件为例:

[root@localhost tst]# ls
mkprj.sh.1  mkprj.sh

看两个文件的差异:
[root@localhost tst]# diff mkprj.sh mkprj.sh.1
20,21c20
< cd $workdir/fornew; mkdir crosstools kernel nfs_root uboot;
< cd $workdir/farsight; mkdir crosstools kernel nfs_root uboot;
---
> cd $workdir/farsight1; mkdir crosstools kernel nfs_root uboot;
23c22
<
---
> cd $workdir/configs2;

1. 做补丁patch
[root@localhost tst]# diff mkprj.sh mkprj.sh.1  > mk_patch
2. 打补丁patch

[root@localhost tst]# patch mkprj.sh < mk_patch
patching file mkprj.sh

观察两个文件,已经相同:
[root@localhost tst]# diff mkprj.sh mkprj.sh.1 

3. 卸载补丁patch

[root@localhost tst]# patch -R mkprj.sh  < mkpatch
patching file mkprj.sh

观察两个文件,mkprj.sh又变回原来的样子了.
[root@localhost tst]# diff mkprj.sh mkprj.sh.1
20,21c20
< cd $workdir/fornew; mkdir crosstools kernel nfs_root uboot;
< cd $workdir/farsight; mkdir crosstools kernel nfs_root uboot;
---
> cd $workdir/farsight1; mkdir crosstools kernel nfs_root uboot;
23c22
<
---
> cd $workdir/configs2;

二、针对目录的patch

#ls /work/kernel

linux-2.6.22.6    linux-2.6.22.6_jz2440

1. 做补丁patch

#diff -Naur linux-2.6.22.6/    linux-2.6.22.6_jz2440/   > linux-2.6.22.6_jz2440.patch

#ls /work/kernel

linux-2.6.22.6    linux-2.6.22.6_jz2440   linux-2.6.22.6_jz2440.patch

2. 打补丁patch

#cd /work/kernel/linux-2.6.22.6

patch -p1 < ../linux-2.6.22.6_jz2440.patch

3. 卸补丁(-R)

patch -R -p1 < ../linux-2.6.22.6_jz2440.patch