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Howto merge pdf documents

$ gs -sDEVICE=pdfwrite -dNOPAUSE -dQUIET -dBATCH -sOutputFile=out.pdf *.pdf

Howto disable launching X on /dev/console

Can't just disable gdm(1m), since it takes care of launching Xnewt for Sun Ray thin clients. Instead, disabled just primary ConsoleKit seat by setting Hidden attribute to true in /etc/ConsoleKit/seats.d/00-primary.seat configuration file:

$ grep Hidden /etc/ConsoleKit/seats.d/00-primary.seat
#Hidden=false
Hidden=true

More info in console-kit-daemon(1m) man page.