A simple Ghostscript command to merge two PDFs in a single file is shown below:
gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=combine.pdf -dBATCH 1.pdf 2.pdfInstall Ghostscript:
Type the command sudo apt-get install ghostscript to download and install the ghostscript package and all of the packages it depends on.