$ go get -u ekyu.moe/sha3sum/...
# sha3sum will then be installed under $GOPATH/bin
$ export PATH=$PATH:$GOPATH/bin
$ echo -n "Hello, 世界" | sha3-224sum
$ shake128sum --help
Usage: shake128sum [OPTION]... [FILE]...
Print or check SHAKE-128 checksums.
With no FILE, or when FILE is -, read standard input.
-s, --size length of output (bytes) for SHAKE-128, default 32
-c, --check read SHAKE-128 sums from the FILEs and check them
The following three options are useful only when verifying checksums:
--ignore-missing don't fail or report status for missing files
--quiet don't print OK for each successfully verified file
--status don't output anything, status code shows success
-h, --help display this help and exit
The sums are computed as described in FIPS-202.
When checking, the input should be a former output of this program.
The default mode is to print a line with checksum, a space,
and name for each FILE.
-s flag is only available for shake128sum and shake256sum.