Not finding sha256sum

[David Highley]

I read what looks to be the manuals for release 5.93 of GNU coreutils
which indicates there is a sha256sum command. I down load and build 5.93
and find no sha256sum command.

http://www.gnu.org/software/coreutils/manual/html_mono/coreutils.html

This manual documents version 5.93 of the gnu core utilities, including
the standard programs for text and file manipulation.

6.6 sha2 utilities: Print or check SHA-2 digests

The commands sha224sum, sha256sum, sha384sum and sha512sum compute
checksums of various lengths (respectively 224, 256, 384 and 512 bits),
collectively known as the SHA-2 hashes. The usage and options of these
commands are precisely the same as for md5sum. See md5sum invocation.

Note: The SHA384 and SHA512 digests are considerably slower to compute,
especially on 32-bit computers, than SHA224 or SHA256.