cksum - checksum and count the bytes in a file
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documents the GNU version of
computes a cyclic redundancy check (CRC) for each named file, or the
standard input if none are given or when a file named `-' is given.
It prints the CRC for each file along with the number of bytes in the
file, and the file name unless no arguments were given.
is typically used to make sure that files have been transferred
by unreliable means (such as netnews) have not been corrupted, by
output for the received files with the
output for the original files.
The CRC algorithm is specified by the POSIX.2 standard. It is
not compatible with the BSD or System V
programs; it is more robust.
Print a usage message and exit with a status code indicating success.
Print version information on standard output then exit.