diff 比较两个文件夹

转摘自：http://blog.chinaunix.net/uid-14735472-id-111118.html

[root@localhost ~]# diff -urNa dir1 dir2

-a  Treat  all  files  as text and compare them     
    line-by-line, even if they do not seem to be text.

-N, --new-file
    In  directory  comparison, if a file is found in
    only one directory, treat it as present but empty
    in the other directory.

-r  When comparing directories, recursively compare
    any subdirectories found.

-u  Use the unified output format.

 2022  mkdir patch
 2023  cd patch
 2024  ls
 2025  mkdir old
 2026  mkdir new
 2027  cp /home/bootable/recovery/miui new/ -rf
 2028  cp /home/miui_recovery-master/src/miui old/ -rf
 2029  diff -urNa new/ old/
 2030  diff -urNa new/ old/ > debug.diff
 2031  gedit debug.diff 
 2035  cd old/
 2036  patch -p1 < ../debug.diff