6.5 md5sum: Print or check MD5 digests
md5sum computes a 128-bit checksum (or fingerprint or message-digest) for each specified file.
Syntax :
md5sum [OPTION]... [FILE]...
$ md5sum index.png 4191736479ed247941e1bf20830618ad index.png
Command usage examples with options :
Example 1: Store the MD5 checksum in file and then verify it.
$ md5sum /home/mandeep/test/test.cpp > checkmd5.md5
It will store the MD5 checksum for test.cpp in file checkmd5.md5
$ md5sum -c checkmd5.md5
It will verify the contents of file
Output :
/home/mandeep/test/test.cpp: OK
After changing the contents of file checkmd5.md5, the output will be :
/home/mandeep/test/test.cpp: FAILED md5sum: WARNING: 1 computed checksum did NOT match