Script Adblock para Linux Hosts [MoAB Agressivio]

#!/bin/bash
# Init
FILE="/tmp/out.$$"
GREP="/bin/grep"

## Script Original Encontrado no Fórum Kubuntu. Todos os créditos ao verdadeiro autor:
## https://www.kubuntuforums.net/showthread.php?56419-Script-to-automate-building-an-adblocking-hosts-file
## Modificado para funcionar como uma tarefa do sistema:
## http://pastebin.com/u/corrosiontears

# Make sure only root can run our script
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# If this is our first run, save a copy of the system's original hosts file and set to read-only for safety
if [ ! -f ~/hosts-system ]
then
 echo "Saving copy of system's original hosts file..."
 cp /etc/hosts ~/hosts-system
 chmod 444 ~/hosts-system
fi

# Perform work in temporary files
temphosts1=$(mktemp)
temphosts2=$(mktemp)

# Obtain various hosts files and merge into one
echo "Downloading ad-blocking hosts files..."
wget -nv -O - http://winhelp2002.mvps.org/hosts.txt >> $temphosts1
wget -nv -O - http://hosts-file.net/ad_servers.asp >> $temphosts1
wget -nv -O - http://someonewhocares.org/hosts/hosts >> $temphosts1
wget -nv -O - "http://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext" >> $temphosts1

# MoaAB Experimental:
wget -nv -O - https://dl.dropboxusercontent.com/u/39421859/hosts  >> $temphosts1

# ZeusTracker Experimental:
wget -nv -O - "https://zeustracker.abuse.ch/blocklist.php?download=baddomains" >> $temphosts1

# HostsFile Experimental:
wget -nv -O - http://www.hostsfile.org/Downloads/hosts.txt >> $temphosts1

# Do some work on the file:
# 1. Remove MS-DOS carriage returns
# 2. Delete all lines that don't begin with 127.0.0.1
# 3. Delete any lines containing the word localhost because we'll obtain that from the original hosts file
# 4. Replace 127.0.0.1 with 0.0.0.0 because then we don't have to wait for the resolver to fail
# 5. Scrunch extraneous spaces separating address from name into a single tab
# 6. Delete any comments on lines
# 7. Clean up leftover trailing blanks
# Pass all this through sort with the unique flag to remove duplicates and save the result
echo "Parsing, cleaning, de-duplicating, sorting..."
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/#.*$//' -e 's/[ \t]*$//' < $temphosts1 | sort -u > $temphosts2

# Combine system hosts with adblocks
echo Merging with original system hosts...
echo -e "\n# Ad blocking hosts generated "$(date) | cat ~/hosts-system - $temphosts2 > ~/hosts-block

# Create a new hosts file [Edited]
echo Creating new hosts file...
cp -r ~/hosts-block /etc/hosts

# Clean up temp files and remind user to copy new file
echo "Cleaning up..."
rm $temphosts1 $temphosts2
echo "Done."

echo
echo "New file created and added to /etc/hosts"
echo "Now enjoy your system without adds ;)"

echo
echo "You can always restore your original hosts file with this command:"
echo " sudo cp ~/hosts-system /etc/hosts"
echo "so don't delete that file! (It's saved read-only for your protection.)"
echo