I am creating a large
tar archive and I would like to create the checksum of the archive too. I could achieve it like this:
$ tar cfz archive.tar.gz files $ sha256sum archive.tar.gz > archive.tar.gz.sha256sum
But the archive file is huge and on slow media, so I'd prefer not to have to read it all in again after writing it out.
Can I build a pipeline that will hash the file as it writes it? I thought maybe I could do this with the
tee utility, but that only writes to a file, not to the standard input of another command.