Working with pdf files

Install qpdf:

sudo apt install qpdf

See docs on qpdf: https://qpdf.readthedocs.io/en/stable/cli.html. qpdf gives you precise control over pdfs.

To rotate a pdf file 180 degrees:

qpdf in.pdf out.pdf --rotate=+180

or, if you’re ok with modifying your original pdf file:

qpdf in.pdf --replace-input --rotate=+180

To join a bunch of pdf files into one file:

pdfunite in-1.pdf in-2.pdf in-3.pdf out.pdf

To extract one page from a pdf file:

xxx

To extract multiple, or a range of pages from a pdf:

xxx