gs: add page (#2199)

pages/linux/gs.md

@@ -0,0 +1,27 @@
+# gs
+
+> GhostScript is a PDF and PostScript interpreter.
+
+- To view a file:
+
+`gs -dQUIET -dBATCH {{file.pdf}}`
+
+- Reduce PDF file size to 150 dpi images for reading on a ebook device:
+
+`gs -dNOPAUSE -dQUIET -dBATCH -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -sOutputFile={{output.pdf}} {{input.pdf}}`
+
+- Convert PDF file (pages 1 through 3) to an image with 150 dpi resolution:
+
+`gs -dQUIET -dBATCH -dNOPAUSE -sDEVICE=jpeg -r150 -dFirstPage={{1}} -dLastPage={{3}} -sOutputFile={{output_%d.jpg}} {{input.pdf}}`
+
+- Extract pages from a PDF file:
+
+`gs -dQUIET -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile={{output.pdf}} {{input.pdf}}`
+
+- Merge PDF files:
+
+`gs -dQUIET -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile={{output.pdf}} {{input1.pdf}} {{input2.pdf}}`
+
+- Convert from PostScript file to PDF file:
+
+`gs -dQUIET -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile={{output.pdf}} {{input.ps}}`