6 Summarizing files

These commands generate just a few numbers representing entire contents of files.

wc invocation    Print newline, word, and byte counts.
sum invocation    Print checksum and block counts.
cksum invocation    Print CRC checksum and byte counts.
b2sum invocation    Print or check BLAKE2 digests.
md5sum invocation    Print or check MD5 digests.
sha1sum invocation    Print or check SHA-1 digests.
sha2 utilities    Print or check SHA-2 digests.