info > sha1sum(1)

📝 Name

sha1sum — Print or check SHA-1 digests

🚀 Quick Reference

🔐 6.6 'sha1sum': Print or check SHA-1 digests

sha1sum computes a 160-bit checksum for each specified FILE. The usage and options of this command are precisely the same as for md5sum. 🔗 See md5sum invocation for details.

💡 Note: The SHA-1 digest is more reliable than a simple CRC (provided by the cksum command) for detecting accidental file corruption, as the chances of accidentally having two files with identical SHA-1 are vanishingly small. However, it should not be considered secure against malicious tampering: although finding a file with a given SHA-1 fingerprint is considered infeasible at the moment, it is known how to modify certain files, including digital certificates, so that they appear valid when signed with an SHA-1 digest. For more secure hashes, consider using SHA-2, or the newer b2sum command. 🔗 See sha2 utilities and b2sum invocation for details.