In simple words, if you download a file from a web site and the md5sum result matches the one provided by the web site, your file has practically been downloaded OK.(There is always a theoretic probability that 2 different files can have the same md5sum)
So, how do we do this md5sum?
On Linux it is very easy, as most distributions include the program needed.
Open a terminal and type:
Replace the ubuntu-8.04.1-desktop-i386.iso with the file you want to check.
This will produce something like this:
8895167a794c5d8dedcc312fc62f1f1f ubuntu-8.04-desktop-i386.isoTo md5sum a file in Windows you need to use a utility such as:
Compare that result with the one provided on the website and if they are
exactly the same,your file has no problem.
Unless you fall victim to Murphy's Law!!Just a note on Downloading and checking files when using Firefox.
Usually the default setting is to download files to the Desktop. When
you want to do a md5sum on a iso file like Puppy which is now on your
Type cd Desktop
you should now have: ~/Desktop$ with the flashing cursor
displayed now in Terminal
Type md5sum ubuntu-8.04-desktop-i386.iso
Your numbers will come up after a few seconds depending on
how large the file is, be patient.
Advanced CheckSum Verifier