Linux md5sum 命令使用方法
MD5算法常常被用来验证网络文件传输的完整性，防止文件被人篡改。一、生成一个文件的md5值
root@vpser:~# md5sum vpser.txt
11df51eb21ee0634e47988a0d8136f21 vpser.txt
二、检查文件是否改变
root@vpser:~# touch file1 file2
root@vpser:~# ls
file1 file2 patch.log
root@vpser:~# md5sum file1 file2 > f1f2.md5
root@vpser:~# md5sum --check f1f2.md5
file1: OK
file2: OK
root@vpser:~# echo "change" >>file1
root@vpser:~# md5sum --check f1f2
file1: FAILED
file2: OK
md5sum: WARNING: 1 of 2 computed checksums did NOT match
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