cksum—Checksum and count the bytes in a file
cksum [—help] [—version] [file…]
This manual page documents the GNU version of cksum. cksum 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 filename unless no arguments were given.
cksum is typically used to make sure that files transferred by unreliable means (such as netnews) have not been corrupted. This is accomplished by comparing the cksum output for the received files with the cksum 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 sum programs; it is more robust.
|—help||Print a usage message and exit with a nonzero status.|
|—version||Print version information on standard output then exit.|