cksum [man page] - checksum and count the bytes in a file


cksum [FILE]...
cksum [OPTION]


Create a file file.txt with the following text:

Samba file and printer sharing is supported by  
all Linux Distributions:Suse Linux, Debian
Linux, Mandrake Linux, Red Hat Linux,
Fedora Linux, Gentoo Linux .

cksum see content of the file

$ cksum file.txt 

cksum generate cksum number
cksum calculates a cyclic redundancy check (CRC) of an any given file. Users can check the integrity of any file and see if the file has been modified. Use your favorite text editor and remove a "." from the end of the sentence to see that CRC will change.

$ cat file.txt 

cksum modified file content

$ cksum file.txt 

cksum generates different cksum number

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