Merge many pdf into one pdf without installing another programme
You can use Ghostscript to merge many pdf into one pdf.
Ghostscript might already be installed on your operating system
On GNU/Linux, you can check by opening your terminal and running:
$ dpkg -s ghostscript
dpkg is a package manage, -s or –status is to check the status of a programme.
To merge many pdf files into one single pdf file run:
$ gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=final.pdf pdf-to-be-merged-1.pdf pdf-to-be-merged-2.pdf pdf-to-be-merged-3.pdf