Sat Oct 5 1991 1:41AM, Linus sent this mail to minix Usenet group:
http://groups.google.com/group/comp.os.minix/msg/2194d253268b0a1b
One Day One GNU/Linux Command
=============================
sha1sum - Compute & Check Secure Hash Algorithm Std 1 message digest.
Summary:
`sha1sum' computes a 160-bit checksum/fingerprint/message-digest for
each specified file. `sha1sum' can also determine whether a file &
checksum are consistent. The sums are computed as per the FIPS-180-1
[http://www.itl.nist.gov/fipspubs/fip180-1.htm].
Example:
$ sha1sum file -- Compute and print the MD5 checksum of that file.
$ sha1sum -c input.txt -- Read checksum and filename from the file and
validate checksums.
$ sha1sum -w -c input.txt -- Same as above and warn if the checksums
format is wrong in the file.
$ sha1sum --status -c input.txt -- Indicate the status in exit status
code.
Read: man sha1sum
input.txt Format:-
2bff10a7855964335a86e84efb5f4ce9c40d4cfd file1
e62341664decd9f55896ab3635697de29ed1077f file2
9b088ddc22456233a76 file3
HTH :)
--
Bharathi S
