Command line tools: qpdf, mutool.

• merge multiple PDF files

  qpdf --empty --pages input1.pdf input2.pdf -- output.pdf

• extract pages 1-10 and drop metadata for the rest pages

  qpdf --empty --pages input.pdf 1-10 -- output.pdf

• rotate all the pages for 90 degree

  qpdf input.pdf --rotate=+90 output.pdf

• extract pages 1-10 (fonts and forms not supported)

  mutool convert -o output.pdf input.pdf 1-10

• remove PDF password protection (need to know the password)

  mutool clean -p "myPassword" -D input.pdf output.pdf

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