This post is mostly about Security Hash Algoritms and how you can use them to verify the integrity of your files.
Let’s say you downloaded something. The website had a sha1sum there and you want to verify that you actually got the file you wanted – and not some tampered malware. Checking is as easy as writing:
sha1sum <filename> .
Or if you want to verify a checksum even more easily, pipe it and use grep.
sha1sum <filename> | grep <checksum_listed_on_the_page> .
If you get the hash as an output that usually means that things are ok. If you get nothing then there is a mismatch.
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