, hash checksum sha256 md5 , , pete@thinkpad:~/bin$ cat hello.txt , hello world , , pete@thinkpad:~/bin$ sha256sum hello.txt , a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447 hello.txt , , pete@thinkpad:~/bin$ md5sum hello.txt , 6f5902ac237024bdd0c176cb93063dc4 hello.txt ,