Echo hash only from shasum

Question

Is there a way to get shasum to only print the hash?

I know this can be achieved by piping the output to another program, e.g.

shasum something | cut -d' ' -f1

Is there a way to achieve this only using shasum, without having to pipe the result somewhere else?

Answer 1

No, shasum always prints the filename of the file that it computes the hash for, or - if it reads from standard input.

To avoid the pipe, you could use

perl -MDigest::SHA -e '$s=Digest::SHA->new(); $s->add(<>); print $s->hexdigest(),"\n"' filename