Merging multiple PDFs

I’d recently downloaded a bunch of separate PDFs that I wanted to turn into a handy file that I could carry around. After grabbing the PDFs, I merged them with:

$ pdfunite *.pdf really-big-output.pdf

PDFUnite is part of Poppler, so be sure to:

$ sudo apt install poppler-utils

… if you don’t have it already. That’s it!