I hate writing address label programs. I wrote address label programs in COBOL for line-printers with fanfold paper in the 1980's. Word processors have been invented since then and fewer people need address labels. However people still do need address labels from time-to-time, and they'll be happy if they can just put the labels in the printer and run a list without having to fuss with boilerplates and .csv files.
A customer called and their current version of Open Office wasn't merging their .csv files the way it used to. I pulled in Libre Office, and that failed too (but in a different way). Now I have close to 500 labels I need to produce and my favorite open source word processors have left me swinging.
So I pulled LaTeX out of my toolbox. It took me a few clumsy attempts before I found this link:
and discovered LaTeX had a package for labels already!
Here's the few lines for an 5161 label:
\BottomBorder=.35in %.25 close
And that's it. And the customer_list.dat file is just address lines in a single column with a blank line between each record. So armed with that little bit of code, I was able to stab in a small Perl script to toss the .csv file into a pdf suitable for printing labels.