gpg --keyserver wwwkeys.eu.pgp.net --recv $KEY
gpg --export --armour $KEY | apt-key add -

Alternativ:

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com KEY

pdfcrop.pl --bbox "60 27 781 510" INFILE OUTFILE

pdfnup --nup 2x4 --delta "0.2cm 0.2cm"  INFILE

pdftk INFILE1 INFILE2 INFILE3 cat output OUTFILE

rename 's/\.JPG/\.jpg/g' *.JPG