Bash Script to check PDF's

gistfile1.sh

#!/bin/bash
# This script should iterate through the 13K PDF's that I have, and hopefully 
# tell me which ones are different.  

# Check to see that yes, we actually got an argument...

[ "$#" -eq 1 ] || die "1 argument required, $# provided"

# Let's read the output from diff, and then iterate through the list.
#
# Sample output from diff:
#
#Binary files /contracts/prod/attachments/offers_2713-2812/271233/618932.pdf and /contracts2/prod/attachments/offers_2713-2812/271233/618932.pdf differ
#Binary files /contracts/prod/attachments/offers_2713-2812/271243/619378.pdf and /contracts2/prod/attachments/offers_2713-2812/271243/619378.pdf differ
#
#

while read line 
do
	f1=`echo $line | awk '{print $3}'`
	f2=`echo $line | awk '{print $5}'`
	# Check to make sure both files exist..
	if [ -f $f1 ] 
	then
		if [ -f $f2 ]
		then
			# Ok...let's do this ish!
			compare $f1 $f2 -compose src diff.pdf

			gs -o diff.ppm -sDEVICE=ppmraw -r72 -g`identify -format "%[fx:(w)]x%[fx:(h)]" diff.pdf` diff.pdf
			gs -o white.ppm -sDEVICE=ppmraw -r72 -g`identify -format "%[fx:(w)]x%[fx:(h)]" diff.pdf` -c "showpage"
			md51=$(md5sum diff.ppm|awk '{print $1}')
			md52=$(md5sum white.ppm|awk '{print $1}')		
			if [ "x${md52}" == "x${md51}" ]
			then
				echo "cp $f1 $f2" >> /root/runme.sh
			else
				# The files are different...
				echo "$f1 $f2" >> /root/imagediff.out
			fi
		fi
	fi	
done < "$1"