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b2sum: Print or check BLAKE2 digests
b2sum 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.
-l’--length’
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.