cksum -a sha2 --length 256 plaintext.txt > b-sha2.txt
reads the plaintext file and calculates a unique hash string using the SHA2-256 cryptographic algorithm and writes it into b-sha2.txt
cksum -a sha3 --length 256 plaintext.txt > b-sha3.txt
reads the plaintext file and calculates a unique hash string using the SHA3-256 cryptographic algorithm and writes it into b-sha3.txt