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openssl
Used for a lot of...you know...openssl stuff.
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Get SHA1 hash of a file
openssl sha1 name-of-file.ext
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Example
openssl sha1 Vulnhub-BillyMadisonBeta01.zip
SHA1(Vulnhub-BillyMadisonBeta01.zip)= 422cd8fe6fe3ce8a69f609bb166a96c0e1caa210