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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'.
*Note md5sum invocation::.

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