Shutdown Command Via Command Prompt

Shutdown Command Via Command Prompt :-

The 'Shutdown' Command Becomes More Flexible and Automated when used from the Command Prompt.

To Run the 'Shutdown' command from the command prompt, go to 'Start > Run', type 'cmd', and press 'Enter'.
In the black box (the command prompt) type 'Shutdown' and the Switches you want to use with the 'Shutdown' command.
You have to use at least one switch for the shutdown command to work.

The Switches :-
The 'Shutdown' command has a few options called Switches. You can always see them by typing 'shutdown -?' in the command prompt if you forget any of them.

-i: Display GUI interface, must be the first option
-l: Log off (cannot be used with -m option)
-s: Shutdown the computer
-r: Shutdown and restart the computer
-a: Abort a system shutdown
-m \\computername: Remote computer to shutdown/restart/abort
-t xx: Set timeout for shutdown to xx seconds
-c “comment”: Shutdown comment (maximum of 127 characters)
-f: Forces running applications to close without warning
-d [u][p]:xx:yy: The reason code for the shutdown u is the user code p is a planned shutdown code xx is the major reason code (positive integer less than 256) yy is the minor reason code (positive integer less than 65536)

Note :- I’ve noticed using a switch with a '-' sign doesn’t work sometimes.
If you are having trouble try using a '/' in place of '-' in your switches.

Examples :-
shutdown –m \\computername –r –f
This command will restart the computer named computername and force any programs that might still be running to stop.

shutdown –m \\computername –r –f –c “I’m restarting your computer. Please save your work now.” –t 120
This command will restart the computer named computername, force any programs that might still be running to stop, give to user on that computer a message, and countdown 120 seconds before it restarts.

shutdown –m \\computername –a
This command will abort a previous shutdown command that is in progress.

Using A Batch File :-
You can create a file that performs the shutdown command on many computers at one time.

In this example I’m going to create a batch file that will use the shutdown command to shut down 3 computers on my home network before I go to bed.

Open 'Notepad' and type the shutdown command to shut down a computer for each computer on the network.
Make sure each shutdown command is on its own line.
An example of what should be typed in notepad is given below-

shutdown –m \\computer1 –s
shutdown –m \\computer2 –s
shutdown –m \\computer3 -s

Now I’ll save it as a batch file by going to file, save as, change save as type to all files, give the file a name ending with '.bat'. I named mine 'shutdown.bat'.
Pick the location to save the batch file in and save it.

When you run the batch file it’ll shutdown computer 1, 2, and 3 for you.

You can use any combination of shutdown commands in a batch file.

Reveal *****(Asterisk) Passwords Using Javascript

-: Reveal *****(Asterisk) Passwords Using Javascript :-

Want to Reveal the Passwords Hidden Behind Asterisk (****) ?

Follow the steps given below-

1) Open the Login Page of any website. (eg. http://mail.yahoo.com)

2) Type your 'Username' and 'Password'.

3) Copy and paste the JavaScript code given below into your browser's address bar and press 'Enter'.

javascript: alert(document.getElementById('Passwd').value);


4) As soon as you press 'Enter', A window pops up showing Password typed by you..!


Note :- This trick may not be working with firefox.

Reveal Passwords Using Javascript

Hide Entire Drives Partition Without Registry

Here is a cool technique which hides entire hard disk drives by a simple procedure.
This is the best security tip to be employ against unauthorised users.

1) Go to Start > Run > type "diskpart".
A DOS window will appear with following description.

DISKPART>

2) Then type "list volume"
The result will look something like one as shown below-
http://www.insecure.in/images/hide_drive.gif

3) Suppose you want to hide drive E then type "select volume 3"
Then a message will appear in same window { Volume 3 is the selected volume}

4) Now type "remove letter E"
Now a message will come { Diskpart Removed the Drive letter }

sometime it requires to reboot the computer.
Diskpart will remove the letter.

Windows XP is not having capabilty to identify the unknown volume.
Your Data is now safe from unauthorised users.

To access the content of hidden Drive repeat the process mentioned above. But in 4th step replace " remove" by "assign".
It means type "assign letter E". 

Calculations On Command Prompt

the command processor CMD.EXE comes with a mini-calculator that can perform simple arithmetic on 32-bit signed integers:

C:\>set /a 2+2
4
C:\>set /a 2*(9/2)
8
C:\>set /a (2*9)/2
9
C:\>set /a "31>>2"
7

Note that we had to quote the shift operator since it would otherwise be misinterpreted as a "redirect stdout and append" operator.

For more information, type set /? at the command prompt.

The ZIP of Death

This is a exploit of the compression algorithms to make a small zip that will extract into extream amounts their are more ways and better ones than this one but i will only show how to make a simple 1k = 1m ratio.

1) Make a.txt file

2) Open and type the null character (alt + 255)

3) Press ctrl + a then ctrl + v a couple times to make some null bytes

4) If u have a hexeditor make the hex 00 for about 50 kilobytes.

5) Now make several copies of a.txt and name accordinly

6) Open cmd.exe

7) Type copy /b *.txt b.txt

8) Now every copy is made into a super copy and repeat

9) Once you have a nice empty big text file like 1gb. Put it in a zip archive.
Because of the simple construction of the file, 1gb of null bytes.....!

The zip is only 1 mb in size and can really annoy freinds.
For added fun hex edit the zip and you will see a bunch of hex 5555

Just add some more and the file will expand amazingly

Make sure to not open this after

You can always create your zip of death from the command line in linux
dd if=/dev/zero bs=1000 count=1000000 | gzip > test.gz

c code for extraction of attributes of BMP file

/*BMP Attributes.C*/

#include<stdio.h>

#include<conio.h>

#include<string.h>

#include<graphics.h>

MATLAB program to study the various morphological operation on binary image

\\ MATLAB program to study the various morphological operation on binary image.\\

clc;

clear all;

close all:

I=imread(C:\aish.bmp);

figure