A small tutorial for the program "md5" or "md5sum" commonly called "checksum".
The md5sum utility is use to calculate what is called the fingerprint of a file. ( the checksum is a value of 128 bits corresponding to a checksum calculated from the archive).
An MD5 checksum is not intended to guarantee the provenance of a file or file group. His interest is to verify the integrity of retrieved data. Indeed, no one is immune from disturbance or a network problem which results in the corruption of an archive is being downloaded.
Under GNU/Linux, all you have to do is to go to the directory containing your file to verify and type the following command:
$md5sum filename [Enter].
The result should appear after a few seconds as follows (same as in Windows):
If you don't want to go to the directory containing the file to be checked, you can also specify a path like this:
$md5sum /home/user/download/filename [Enter]
Note that: Remember to use the "completion" (press the TAB key) to complete your command lines.
Via a Graphical User Interface
There is a project called Parano offering a GUI for the creation/editing/checking MD5 or SHA-1 under Gnome.
The project seems to be discontinued, but still it may be helpful
Generate a MD5 sum
For Windows and GNU/Linux
To generate an MD5 sum, you must simply perform the same operation as the verification, namely:
md5sum filename [Enter]
The filename can be any type of file (archive, images, text, iso, executable, etc.. etc..).
On Windows, the command is not always present natively.
If you want to create a text file (my_file_md5sum.txt), you must redirect the output of the md5sum command to the text file itself instead of standard output, namely the screen. Use the redirector ">", common to Windows and GNU/Linux.