# divers - pdf
# reduce pdf size
How can I reduce the file size of a scanned PDF file? - askubuntu.com
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
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with -dPDFSETTINGS=/ebook works well, a 15mo 300dpi file is reduced to a 3mo 150dpi file.
# merge several pdf in one
How to merge several PDF files? - askubuntu.com
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dAutoRotatePages=/None -sOutputFile=finished.pdf file1.pdf file2.pdf
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gs starts the Ghostscript program.
-dBATCH once Ghostscript processes the PDF files, it should exit.
If you don't include this option, Ghostscript will just keep running.
-dNOPAUSE forces Ghostscript to process each page without pausing for user interaction.
-q stops Ghostscript from displaying messages while it works
-sDEVICE=pdfwrite
tells Ghostscript to use its built-in PDF writer to process the files.
-sOutputFile=finished.pdf
tells Ghostscript to save the combined PDF file with the specified name.
-dAutoRotatePages=/None
Acrobat Distiller parameter AutoRotatePages controls the automatic orientation selection algorithm: For instance: -dAutoRotatePages=/None or /All or /PageByPage.
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Your input files don't even need to be PDF files. You can also use PostScript or EPS files, or any mixture of the three.