Ghostscript
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Ghostscript is a program used to convert and manage PDF files from the command line.
Reduce File size of scanned PDF
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dDetectDuplicateImages -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
-dPDFSETTINGS=/screen lower quality, smaller size.
-dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs.
-dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting
-dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting
-dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file.
To combine PDFs, add more input files on the end of this command.