Working with PDF files...

Today I had to work with some pdf files.

Actually, I needed to convert some LibreOffice files to pdf format.  That was not a problem: it was as easy as clicking the button "export as pdf."

The problem was that I needed to add an image to a specific page and that for some strange reason was not possible on LibreOffice.  Well, it was, but moving or resizing did not work.

Thus, I thought of Inkscape.  Still, Inkscape only works with one page at a time and thus I ended up with a split document.

Now, merging pdfs on Linux is not hard.  I followed this tutorial. 

And that took care of the problem! 

I learned a useful command on the CLI: pdfunite.