How to calculates CRC checksum and the byte count for file(s)

cksum prints the CRC checksum for each file along with the number of bytes in the file, and the file name unless no arguments were given.cksum is typically used to ensure that files transferred by unreliable means have not been corrupted, by comparing the cksum output for the received files with the cksum output for the original files (typically given in the distribution).The CRC algorithm is