Supported mode sha3-224, sha3-256, sha3-384, sha3-512
By default sha3-256
-m [mode] for mode mode 224 or 256 or 384 or 512
./sha3 -m 256 file1 file2 ...For shake :
shake mode 128 or 256 -s for shake and -o for output_lengh
./sha3 -s 256 -o [output_lengh] file1 file2 ...https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
https://keccak.team/files/Keccak-reference-3.0.pdf
https://emn178.github.io/online-tools/shake_256_checksum.html