how to concatenate pdf

gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf in1.pdf in2.pdf in3.pdf

emacs text mode menubar

On text-only terminals with no mouse, you can use the menu bar by typing M-' or (these run the command tmm-menubar).

from
http://linux.about.com/od/emacs_doc/a/emacsdoc317.htm