Sha1sum

= sha1sum =

This is a command that computes a SHA-1 checksum for a list of files.

Provided by
Most (all?) Linux distributions incorporate this from the GNU Coreutils: and use its man page

Related commands
These are related to summarizing the contents of files.
 * wc
 * sum
 * cksum
 * md5sum
 * sha2 utilities