And check the file and bytes

CKSUM

NAME (name)

cksum - Check bytes and a file, and

SYNOPSIS (Overview)

../src/cksum [OPTION]... [FILE]...

DESCRIPTION (description)

Output CRC (cyclic redundancy check code), and checks and the number of bytes per FILE.

--help
Display help and exit
--version
Output version information and exit 

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Origin www.cnblogs.com/niezhongle/p/11068352.html