#!/bin/sh
if [ x$1 == x ]; then
    echo "Need argument, a page number"
    exit 2
fi
files=`ls [0-9]*.php | cut -d"." -f1 | sort -nr`
for f in $files; do
    if [ $f -ge $1 ]; then
        newf=`expr $f + 1`
        sed $f.php -e "s/$f/$newf/g" > $newf.php
        mv $f.content $newf.content
    fi
done