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+# PDF operations
+
+## Merge
+
+    gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=out.pdf in1.pdf in2.pdf
+
+## Compress
+
+    gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/default -dNOPAUSE -dQUIET -dBATCH -dDetectDuplicateImages -dCompressFonts=true -r150 -sOutputFile=output.pdf input.pdf
+
+## Extract pages
+
+    pdfjam --outfile out.pdf in.pdf 1,3,4-7