Linux命令之乐–md5sum

md5sum命令用于生成和校验文件的md5值。它会逐位对文件的内容进行校验，它常用于检查文件的完整性。

读取文件的MD5值

[root@new ~]# md5sum /usr/local/sbin/* >>file.md5
[root@new ~]# cat file.md5
74fd7e1f2730b5f8353d7a5f417747ef  /usr/local/sbin/demo.sh
8bd8f8743b02a33882bca8fcb2234261  /usr/local/sbin/array.sh
d7e30c2d897f0fdd9b157e9a5e9fbfbc  /usr/local/sbin/debug.sh

检查文件是否完整

[root@new ~]# md5sum -c file.md5
/usr/local/sbin/array.sh: OK
/usr/local/sbin/debug.sh: OK
/usr/local/sbin/demo.sh: OK
[root@new ~]# echo $?
0

测试改变一个文件

[root@new ~]# md5sum -c file.md5
/usr/local/sbin/array.sh: OK
/usr/local/sbin/debug.sh: OK
/usr/local/sbin/demo.sh: FAILED
md5sum: WARNING:  of  computed checksums did NOT match
[root@new ~]# echo $?