High Quality Content by WIKIPEDIA articles! Cksum is a command in Unix-like operating systems that generates a checksum value for a file or stream of data. The cksum command reads the file or files specified as arguments, or standard input if no arguments are provided, and calculates a checksum value, cyclic redundancy check (CRC) and the byte count. The checksum, number of bytes, and file name are written to standard output. The cksum command can be used to verify the equality of two files on different computers, such as a copy made over noisy transmission lines.. (If the files are on the same computer, equality can be verified with the cmp command.) The comparison made by the cksum command is not cryptographically secure. However, it is unlikely that an accidentally damaged file will produce the same checksum as the original file.

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