If you need to calculate a checksum, aka cryptographic hash value or digital fingerprint, on a Mac OS X system, you can use the md5 command to calculate a MD5 checksum, which is equivalent to the md5sum utility on Linux systems, and the shasum command to calculate Secure Hash Algorithms (SHA). The default value for shasum, if no algorithm is specified, is Secure Hash Algorithm 1 (SHA-1), but you can specify other algorithms, such as Secure Hash Algorithm 2 (SHA-2), e.g. SHA-256, using the
-a option. E.g.
-a 256 for SHA-256.
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