No seriously, this is so much better than rebooting into Windows or starting up
wine to open Acrobat, which I have to pay for, and then combing documents into a ‘binder.pdf’. Then I have to rename it and so forth.
Meanwhile by command-line in Ubuntu I could have just gone:
pdfunite in-1.pdf in-2.pdf in-n.pdf out.pdf
Thank you Stack Overflow.