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crc - checksum files


crc file ...


For each file, crc calculates and prints a 32-bit CRC, the byte count, and the file name. It is typically used to validate files transferred between different systems, and is useful in detecting subtle disk corruption. Crc uses a checksum compatible with the DOS version of crc, the 32 bit CRC used by PKZIP version 0.9, as well as the "crc" command in ZCOMM and Professional-YAM (high reliability communications programs).

The 32-bit CRC used is the frame check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level protocol).

32 bit CRC code courtesy Gary S. Brown.


Although extremely unlikely, files with different data may still produce the same crc value.


chek(1), undos(1), todos(1), tocpm(1), sum(1), wc(1).

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