[root@NB index]# ls
index()().html index()().html index()().html
index()().html index()().html
[root@NB index]# md5sum *.html > html.md5
[root@NB index]# tail html.md5
bd34aed02df40946c5eb1e4ac298bea2 index()().html
1ac7667f0041fb3f6ec0ad0b93f0d931 index()().html
34d351ce2480038558e1b187a327861a index()().html
1e5b310361809a527d10ed0441539a73 index()().html
98e7303d73e81784efc0470a754e4d3f index()().html
查看文件是不是被改变：
[root@NB index]# md5sum -c html.md5
index()().html: OK
index()().html: OK
index()().html: OK
index()().html: OK
index()().html: OK
改变一个文件：
[root@NB index]# echo k >> index\(\)\(\).html
[root@NB index]# md5sum -c html.md5
index()().html: FAILED
index()().html: OK
index()().html: OK
index()().html: OK
index()().html: OK
md5sum: WARNING: of computed checksums did NOT match