GhostScript PDF document management GS: Merge Multiple PDFs Into One Introduction You may need to merge multiple PDF files to get only one. Here is the solution. Usage 1gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf `ls *.pdf` This command merges all PDF files in the current directory into one PDF file (the out.pdf file).