cksum(1)							      cksum(1)

NAME
       cksum - print file checksum and sizes

SYNOPSIS
       [file ...]

DESCRIPTION
       The  command  calculates	 and  prints to standard output a checksum for
       each named file, the number of octets in the file and the filename.

       uses a portable algorithm based on a 32-bit  Cyclic  Redundancy	Check.
       This algorithm finds a broader spectrum of errors than the 16-bit algo‐
       rithms used by (see sum(1)).  The CRC  is  the  sum  of	the  following
       expressions, where x is each byte of the file.

	      +	 x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + x^0 x26 + x23 + x22 + x16
	      + x12 + x11 + x10 + x7 + x5 + x4 + x2 + x1 + x0

       The results of the calculation are truncated to a  32-bit  value.   The
       number of bytes in the file is also printed.

       Standard input is used if no file names are given.

       is  typically  used to verify data integrity when copying files between
       systems.

EXTERNAL INFLUENCES
   Environment Variables
       determines the locale to use for the locale categories  when  both  and
       the corresponding environment variable (beginning with do not specify a
       locale.	If is not set or is set to the empty string, a default of  "C"
       (see lang(5)) is used.

       determines  the locale for interpretation of sequences of bytes of text
       data as characters (e.g., single- verses multibyte characters in	 argu‐
       ments and input files).

       determines the language in which messages are displayed.

       If  any	internationalization  variable	contains  an  invalid setting,
       behaves as if all internationalization variables are set to  "C".   See
       environ(5).

RETURN VALUE
       Upon completion, returns one of the following values:

	      All files were processed successfully.

	      One or more files could not be read or another error occurred.

       If  an  inaccessible  file  is  encountered,  continues	processing any
       remaining files, but the final exit status is affected.

SEE ALSO
       sum(1), wc(1).

STANDARDS CONFORMANCE
								      cksum(1)

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