Eancheck is a command line program that checks barcode number check digits.
I wrote it in C++ (the language I could half-remember from college) when I was 17 and put it on the Debian archives, basically as a proof that a) I can write software and b) I can create Debian packages. Some 17 years later, it turns out that Debian have been dutifully maintaining this as part of their extensive archive of software, including patching it and porting it to a bewildering away of architectures, while I have been off… not maintaining it or doing anything.
And not writing any software.
And not using it myself, because I have zero need to check any barcodes in my life.
And mostly using Macs or Windows anyway.
Whoops.
So anyway, if you are on Debian, you can install the fruits of my teenage labour by running apt-get install eancheck
.
And now, please feel free to download the first upstream release of eancheck in 18 years - the most delayed, and indeed anticipated, sequel since Half-Life 3. Thank you to the various Debian and Ubuntu project members who have worked on my silly teenage folly.