Download files from Issuu

gistfile1.txt

#
# not a script, just a set of cmds
#

printf 'http://image.issuu.com/actual_url/jpg/page_%d.jpg\n' {1..500} > files.txt
wget -i files.txt

# test sed
for filename in page_*.jpg; do echo $filename | sed -e 's/page\_//g'; done

# execute sed rename
for filename in page_*.jpg; do newname=`echo $filename | sed -e 's/page\_//g'`; mv $filename $newname; done

# convert images to pdf
for f in *.jpg; do
  convert ./"$f" ./"${f%.jpg}.pdf"
done

# combine pdfs into one file in numerical order
ls | sort -g -o files2.txt

pdftk <file names in desired order> cat output new_file.pdf