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b2sum: Print or check BLAKE2 digestsb2sum computes a 512-bit checksum for each specified
file. The same usage and options as the md5sum
command are supported. See md5sum invocation.
In addition b2sum supports the following options.
Change (shorten) the default digest length. This is specified in bits and thus must be a multiple of 8. This option is ignored when --check is specified, as the length is automatically determined when checking.