Linux面试必问-对照目录内容的命令“Diff”具体解释

dir1下有个log_1.log dir2下有个log_2.log 两个文件例如以下：

p_ylwu@VM_194_111_sles10_64:/home/jdxochen/exercise> cat -v dir1/log_1.log 

1

3

5

7

9

0

p_ylwu@VM_194_111_sles10_64:/home/jdxochen/exercise> cat -v dir2/log_2.log 

2

4

6

8

0

0

若想看具体的内容差别 使用diff -urNa dir1 dir2

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參数说明：

-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.