coreutils: sha1sum invocation

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1 6.6 ‘sha1sum’: Print or check SHA-1 digests
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1 ‘sha1sum’ computes a 160-bit checksum for each specified FILE.  The
1 usage and options of this command are precisely the same as for
1 ‘md5sum’.  ⇒md5sum invocation.
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1    Note: The SHA-1 digest is more reliable than a simple CRC (provided
1 by the ‘cksum’ command) for detecting accidental file corruption, as the
1 chances of accidentally having two files with identical SHA-1 are
1 vanishingly small.  However, it should not be considered secure against
1 malicious tampering: although finding a file with a given SHA-1
1 fingerprint is considered infeasible at the moment, it is known how to
1 modify certain files, including digital certificates, so that they
1 appear valid when signed with an SHA-1 digest.  For more secure hashes,
11 consider using SHA-2, or the newer ‘b2sum’ command.  ⇒sha2
 utilities.  ⇒b2sum invocation.
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