A ping flood is a simple DoS attack where the attacker overwhelms the victim with ICMP Echo Request (ping) packets. It only succeeds if the attacker has more bandwidth than the victim (for instance an attacker with a DSL line and the victim on a dial-up modem).

In this command replace 192.168.1.100 with victim IP address.

Set Permission to user and group

Courtesy of LifeHacker.com (http://lifehacker.com/5625725/open-the-gnome-applications-menu-with-the-windows-key)

grep 'HOME.*' data.txt | awk '{print $2}' | awk '{FS="/"}{print $NF}'

OR

awk '/HOME/ {print $2}' data.txt | awk -F'/' '{print $NF}'

In this example, we are having a text file that is having several entries like:

---

c1 c2 c3 c4

this is some data

HOME /dir1/dir2/.../dirN/somefile1.xml

HOME /dir1/dir2/somefile2.xml

some more data

---

for lines starting with HOME, we are extracting the second field that is a 'file path with file name', and from that we need to get the filename only and ignore the slash delimited path.

The output would be:

somefile1.xml

somefile2.xml

(In case you give a -ive - pls give the reasons as well and enlighten the souls :-) )

During this operation :

# mv Joomla_1.5.10-Stable-Full_Package.zip /var/www/joomla/

I invoke /var/www/joomla/ as last command argument. To change in this directory I can use

# cd !$

So I go to

hob:/var/www/joomla#

Should do exactly the same - compress every file in the current directory. You can even use it recursively:

Take advantage of sudo keeping you authenticated for ~15 minutes.

The command is a little longer, but it does not require X (it can run on a headless server).

Linux : these script enable you to edit multiple files and remove exact phrase from multiple files

grep -sq "" filename && command

grep can be used in combination with && to run a command if a file exists.

* ps -ef # list running processes

* grep string

* pull the process names from 8th field

* cut and delimiter '/'

* print 4th field

* get rid of trailing grep

* for loop killall -9 $i which is the process name

bvi is your vi for binary editing. If your system does not have it, you can get it from

http://bvi.sourceforge.net/

Using XSLT.

Its very useful when you do not have control over name servers and need to check DNS configuration directly, right after change. You will not need to wait for DNS propagation to verify if all records were configured properly by vendors of name servers.

It suspends to RAM: you always need your batteries for the RAM but it saves time as there is no need to slowly archive everything on your hard disk.

It works fine with me but if anyone has a nicer way, please contribute.

-s

Make a signature.

-e

Encrypt data.

-r

Encrypt for user id name.

That's useful when you're doing some web scraping http://en.wikipedia.org/wiki/Web_scraping and you're trying to test your possibly fake user-agent.

This is the quick and dirty alternative ;)

The whole file will be emptied, this is equal to /dev/null > ~/.ssh/known_hosts