Linux command learning (15)—the use of md5sum and mount --bind commands

Linux command learning (15)—md5sum and mount --bindthe use of commands

Through  the md5sum  command of Linux, a unique MD5 value (128bit) can be calculated for a specified file.

By comparing the MD5 values ​​before and after the file, you can determine whether the file has changed (whether it has been modified).

1. Use md5sum to generate a check code. The command is as follows

md5sum file # 直接查看文件校验

二、mount --bind命令使用示例如下：
mount --bind  /data/临时文件 /usr/bin/源文件
mount --bind  /data/临时文件 /usr/lib/源文件