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CKSUM as a tool to compare integrity of file/files

There are times, when we copy/download CDs, iso files, tar files or any other files, the files seems to be ok but when we try to use it, it generate error or maybe resulting a fail installation. Well, there are many ways to eliminate on what went wrong, and this posting is only trying to help in a way to ensure that the CDs/files are passed the integrity check. What I'm about to share in here is only one way to tell if the files that we've downloaded are corrupted or not. of course there are other ways. in most common Unix-like OS there is a tool called 'cksum' that we can practically use it after OS installation, so no need to install a third party package to use the tool to check the integrity of a file. 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.[1]. (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. Syntax cksum [ File ... ] Usage example $ cksum test.txt 4038471504 75 test.txt $ 4038471504 => This represents the check sum value 75 => This represents the file size of test.txt But this only works on a Unix-like Operating System (including GNU/Linux, *BSD, Mac OS X, and Solaris), what about if we copy it through a windows machine, surely we need a cksum executables file for windows so the result can be compare. There's a tool called 'coreutils' this tool is developed under GPL licenses in this utility we can installed and uses tools such as 'cksum' and any other Unix-Like OS commands. the tools can be download from this link : reference:http://en.wikipedia.org/wiki/Cksum hopes this helps...

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