linux sha1sum Print or check SHA1 (160-bit) checksums. With no FILE, or when FILE is -, read standard input.
sha1sum {file} If you want to send the file together with its sha1sum output redirect the output to a file:
sha1sum {file} > {file}.sha1 Send both files and the other party can do a…
sha1sum -c {file}.sha1 It should show OK if the sha1 is correct.