Split PDFs which have 2-page spreads into 1-per-page PDF - usage ./pdf-singleify input.pdf output.pdf. Requires pdfinfo, ghostscript and pdftk

pdf-singleify

#! /bin/bash
file="$1"
function getDimensions() {
    local page_size=`pdfinfo "$file" | grep "Page size"`
    [[ $page_size =~ ([0-9\.]+)[[:space:]x]+([0-9\.]+) ]]

    let page_width="${BASH_REMATCH[1]/.*} / 2"
    let page_height="${BASH_REMATCH[2]/.*}"
    let offset="-$page_width"
}

function createPages() {
    let local width="$page_width * 10"
    let local height="$page_height * 10"

    gs -o /tmp/"$1"-pages.pdf -sDEVICE=pdfwrite -g${width}x${height} \
    -c "<</PageOffset [$2 0]>> setpagedevice" -f "$file"
}

getDimensions
createPages "left" 0
createPages "right" $offset

pdftk A=/tmp/left-pages.pdf B=/tmp/right-pages.pdf shuffle \
output "$2" verbose

# Delete temp files
rm /tmp/{left,right}-pages.pdf