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BSD 2.11 - man page for crc (bsd section 1)

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CRC(1)											   CRC(1)

       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  use-
       ful in detecting subtle disk corruption.  Crc uses a checksum compatible with the DOS ver-
       sion 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

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

					       OMEN					   CRC(1)
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