Rotate pdf left with pdftk

pdfrotate.sh

#!/bin/sh
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 filename"
    exit 1;
fi

if [ ! -f $1 ]; then
    echo "File not found!"
    exit 2
fi

mv $1 $1.tmp
pdftk $1.tmp cat 1-endleft output $1 

if [ $? -eq 0 ]; then
 rm $1.tmp
else
 mv $1.tmp $1
 echo "Error"
 exit 3
fi

if pdftk is not available, use qpdf instead:
qpdf --rotate=+180:1-z $1.tmp $1