Generate SHA1 hash for each file in a list

find . -type f -exec sha1sum {} >> SHA1SUMS \;
All output is placed in file SHA1SUMS which you can later check with 'sha1sum --check'. Works on most Linux distros where 'sha1sum' is installed.

By: gpenguin
2009-10-05 18:33:59

3 Alternatives + Submit Alt

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.
bwoodacre · 659 weeks 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.
gpenguin · 658 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: