hosts file adblock script

#!/bin/sh
###
# Script that modifies the /etc/hosts file to blacklist malicious and
# advertising-related domains.
###
temphosts=$(mktemp)

# Make a backup if one doesn't already exist
[ ! -e /etc/hosts.bk ] && cp /etc/hosts /etc/hosts.bk

# Download the new hosts file, overwriting the original

## Download various pre-made lists into our temp file

wget -nv -O - http://someonewhocares.org/hosts/hosts >> $temphosts
wget -nv -O - http://winhelp2002.mvps.org/hosts.txt >> $temphosts
wget -nv -O - http://www.malwaredomainlist.com/hostslist/hosts.txt >> $temphosts
wget -nv -O - http://adblock.gjtech.net/?format=hostfile >> $temphosts
wget -nv -O - http://hosts-file.net/ad_servers.asp >> $temphosts
wget -nv -O - "http://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext" >> $temphosts
wget -nv -O - http://www.sysctl.org/cameleon/hosts >> $temphosts
wget -nv -O - http://securemecca.com/Downloads/hosts.txt >> $temphosts


sed -e 's/\r//' -e '/^127.0.0.1/!d' -e '/localhost/d' -e 's/127.0.0.1/0.0.0.0/' -e 's/ \+/\t/' -e 's/#.*$//' -e 's/[ \t]*$//' < $temphosts | sort | uniq -u > /etc/hosts

#
echo "# Last updated on $(date)


127.0.0.1 localhost <your host name here or sudo will hang when you first launch it>

"  | cat - /etc/hosts >> temp && mv temp /etc/hosts

rm $temphosts