A cache warmer in bash using curl

cache-warmer.sh

#!/bin/bash

if [ "$#" -ne 1 ] || [ "x$1" == "x" ] ; then 
    echo "Usage: $0 <sitemap.xml>"
    exit 0;
fi

if [ ! -f "$1" ]; then 
    echo "Sitemap file $1 not found! Exit!"
    exit 1
fi

cat "$1" | perl -ne 'while (/>(http.+?)</g) { print "$1\n"; }' | while read line; do 
    echo "  Crawling $line  "
    curl -so /dev/null -w "%{time_connect} - %{time_starttransfer} - %{time_total}  " $line
done