Extra

Clear big logs

tail -1000 logname > logoname.bkp

>logname

tail -1000 logname.bkp > logoname

rm -rf logname.bkp

SFTP login

sftp -oport=<port number> IP

Clam scan

clamscan -r --log=/root/scanJul20.txt / | grep detect

Iframe checkup

http://www.unmaskparasites.com/

Package administration commands

http://www.debianhelp.co.uk/pkgadm.htm

Backup Configuration Tutorials

http://www.debianhelp.co.uk/backuptools1.htm

Scripts to install codecs

http://scriptmantra.info

To disable ping

echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all

To enable ping

echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

Block an ip range using iptables

iptables -I INPUT -m iprange –src-range 192.168.1.10-192.168.1.13 -j DROP

Google chat integration in to site

A Google Talk chatback badge will let visitors to your web page chat with you. They’ll be able to chat with you whenever you’re signed in to Google

This one is more light weight. Not so stylish as meebo, but it loades faster. Also you just need to open gmail to start chating with your visitors.

To get one visit.

Prevent SYN attack

1. Enable SYN cookies mechanism in the server by the executing command:

# echo 1 > /proc/sys/net/ipv4/tcp_syncookies

2. Increase the backlog queue to 2048 by the command:

# sysctl -w net.ipv4.tcp_max_syn_backlog=”2048″

Script used to find vulnerable PHP files -- From Linux stuffs

#!/bin/bash

for user in `/bin/ls /var/cpanel/users`

find /home/$user/public_html $ -name ‘*.php’ -o -name ‘*.cgi’ -o -name ‘*.inc’ $ -exec \

egrep -il “$shellpattern” {} \;

done

ComCode to create a big file

dd if=/dev/zero of=tmpMnt bs=1024 count=100000

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