Linux memo
Convert pdf to png (one page of pdf, one png): pdftoppm -png [pdf file name] [png file name prefix] From https://askubuntu.com/a/50180 Convert all jpg in one directory to pdf (one jpg, one page of pdf): convert *.jpg [Output pdf name] Combine multiple pdf to one pdf: pdftk [First pdf name] ... [Last pdf name] cat output [Output pdf name]