Utilities

Scanning Documents on Linux

compress a PDF (save as optimized)
pdftk scan.pdf rotate 1-endEast output in.pdf

or

pdftk A=scan.pdf shuffle AoddWest AevenEast output in.pdf

or

pdftk in.pdf rotate 2down output in-new.pdf && rm in.pdf && mv in-new.pdf in.pdf

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dBATCH  -dQUIET -sOutputFile=out.pdf in.pdf