glue_pdfs

#!/bin/bash
## Simple shell script to glue pdf-files into a single book
## Uses: gs (ghostscript), mktemp, find, read
## No any checks so fails are possible.
## Author Andrew S. [github,gitlab].com/quarkscript/ Licence GPL
list=$(echo $(find -name "*.pdf" | sed 's@\.\/@"@g' | sort -n)'"' | sed 's@ "@" "@g')
echo ''
echo $list
echo ''
read -p "Is sequence a correct? (y/n) " isrun
if [ "$isrun" == "y" ]; then
    if [ -f book.pdf ]; then
        bookname=$(mktemp book-XXXXXXX.pdf)
    else
        bookname='book.pdf'
    fi
    echo ''
    gs -o "$bookname" -sDEVICE=pdfwrite -f $list
    echo ''
    echo New book name is $bookname
    echo ''
else
    echo ''
    echo You may rename some files and run $0 again
    echo ''
fi