This is a simple b3sum command using github.com/zeebo/blake3.
go get git.wow.st/gmp/b3sum
go install git.wow.st/gmp/b3sum
Usage:
b3sum [flags] [file]...
-h Prints help information
-l int
The number of output bytes, prior to hex encoding (default 32)
-p int
The maximum concurrency (defaults to the number of CPUs)
If no input files are specified, b3sum reads stdin.