Sum up number of PDF pages in a directory

gistfile1.sh

#!/bin/bash
# This sums up the number of pages of all pdfs in a given directory

counter=0
hash pdfinfo 2>/dev/null || { echo >&2 "pdfinfo is required, but not installed. Aborting."; exit 1; }

if [ -n "$1" ]; then dir=$1; else dir="."; fi

for file in $dir/*.pdf; do
	currentcount=$(pdfinfo "$file" | sed -n 's/^Pages:\s*\([0-9]\+\)/\1/p')
	counter=$((counter+currentcount))
done

echo $counter