how to verify whether a compressed .gz is corrupted or not?

I have many gz downloaded from the internet, and I would like to make sure they are not corrupted.

Does the fact that I can open the archive with winzip on windows proves that everything is fine?

I must find a way to check their integrity without unzipping them, as they are way too big. Using Python can be an option.

Thanks!

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4 Answers

Using the gunzip test option

gzip -t file.tar.gz

See How to check if a Unix .tar.gz file is a valid file without uncompressing

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Most sites will give you a check sum of some kind to check the file is good. Most of the time it is a md5sum but there are a few out there. If you can open it that is a good sign but it doesn't always mean it is good.

• Calculate the md5 hash of the file using md5sum filename

• Compare the 2 provided hashes (the one you generated and the one that is provided by the website as @Mat000111 said. if they are different, then the file has been modified or it is corrupted

The gzip utility has a '-t' option which tests file integrity without bothering to unpack the file. That'll tell you if gzip thinks the file is OK.

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