NAME [Toc] [Back]
cksum - print file checksum and sizes
SYNOPSIS [Toc] [Back]
cksum [file ...]
DESCRIPTION [Toc] [Back]
The cksum command calculates and prints to standard output a checksum
for each named file, the number of octets in the file and the
cksum uses a portable algorithm based on a 32-bit Cyclic Redundancy
Check. This algorithm finds a broader spectrum of errors than the
16-bit algorithms used by sum (see sum(1)). The CRC is the sum of the
following expressions, where x is each byte of the file.
x^32 + x^26 + x^23 +x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7
+ x^5 + x^4 + x^2 + x^1 + x^0
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.
cksum is typically used to verify data integrity when copying files
EXTERNAL INFLUENCES [Toc] [Back]
LANG determines the locale to use for the locale categories when both
LC_ALL and the corresponding environment variable (beginning with LC_)
do not specify a locale. If LANG is not set or is set to the empty
string, a default of "C" (see lang(5)) is used.
LC_CTYPE determines the locale for interpretation of sequences of
bytes of text data as characters (e.g., single- verses multibyte
characters in arguments and input files).
LC_MESSAGES determines the language in which messages are displayed.
If any internationalization variable contains an invalid setting,
cksum behaves as if all internationalization variables are set to "C".
RETURN VALUE [Toc] [Back]
Upon completion, cksum returns one of the following values:
0 All files were processed successfully.
>0 One or more files could not be read or another error
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003
If an inaccessible file is encountered, cksum continues processing any
remaining files, but the final exit status is affected.
SEE ALSO [Toc] [Back]
STANDARDS CONFORMANCE [Toc] [Back]
cksum: XPG4, POSIX.2
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: August 2003 [ Back ]