# utility for computing hash sums https://sf.net/p/rhash/

# compute sha256 for a file and store checksum in a file:
rhash --sha256 file.txt > file.sha256

# verify the file(s):
rhash -c file.sha256

# Generate a SHA256 hash file for all files in a directory tree:
rhash -r --sha256 directory/ > directory.sha256

# Verify all .sha256 files in a directory tree:
rhash -cr --crc-accept=sha256 directory/