coreutils: sha2 utilities

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1 6.7 sha2 utilities: Print or check SHA-2 digests
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1 The commands ‘sha224sum’, ‘sha256sum’, ‘sha384sum’ and ‘sha512sum’
1 compute checksums of various lengths (respectively 224, 256, 384 and 512
1 bits), collectively known as the SHA-2 hashes.  The usage and options of
1 these commands are precisely the same as for ‘md5sum’ and ‘sha1sum’.
1 ⇒md5sum invocation.
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