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Generate SHA1 hash for each file in a list

Terminal - Generate SHA1 hash for each file in a list
find . -type f -exec sha1sum {} >> SHA1SUMS \;
2009-10-05 18:33:59
User: gpenguin
Functions: find sha1sum
2
Generate SHA1 hash for each file in a list

All output is placed in file SHA1SUMS which you can later check with 'sha1sum --check'. Works on most Linux distros where 'sha1sum' is installed.

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
ls [FILENAME] | xargs openssl sha1
2009-10-03 02:05:43
User: m00dimus
Functions: ls xargs
1

List files and pass to openssl to calculate the hash for each file.

find . -regex ".*\(avi\|mp4\|wmv\)$" -print0 | xargs -0 sha1sum
sha1sum * >> SHA1SUMS
2010-05-05 18:14:52
User: manny79
Functions: sha1sum
-2

Alternative command for performing an sha1 hash for a given set of files matched by a wildcard

Know a better way?

If you can do better, submit your command here.

What others think

I believe in bash this will append the output of the find command to SHA1SUMS rather than each invocation of sha1sums appending to the file (-exec doesn't use a shell to run sha1sums). Here the result is the same either way but worth mentioning.

Comment by bwoodacre 303 weeks and 2 days ago

Sorry, but I disagree. I just ran it and the SHA1SUMS file contains a list of files with their SHA1 hashes...same as 'md5sum'. Within 'find', everything up to the "\;" is used as the command to execute. Per the 'man find' page:

"All following arguments to find are taken to be

arguments to the command until an argument

consisting of ?;? is encountered."

HOWEVER, the man page does state the behavior of {} in find is different in other flavors of 'find'. So there are probably other differences with other flavors as well.

Comment by gpenguin 303 weeks and 1 day ago

Your point of view

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