When working with computers every now and then I need to check the integrity of downloaded files. This is to make sure that the downloaded file has not been changed or modified, contains no viruses or spyware. Every reliable and self respecting software developer should publish a checksum together with the downloadable file on their websites. A typically checksum might look like something this: L9ThxnotKPzthJ7hu3bnORuT6xI.
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fciv.exe -sha1 WhateverIsYourFilename.exe.
In this example SHA1 checksum algorithm is used,but there are many other hash functions such as MD5 etc.
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