Petroff Defense Trap

1. e4 e5
2. Nf3 Nf6
3. Nxe5 Nxe4
4. Qe2 Nf6
5. Nc6

Now the black Queen is DEAD. Black king is in check by White Queen and his queen is in attack by knight.To save check and his queen he can 5. .. Qe7 but then white can take the queen with knight at d6

PHP Hacking 1 = 1

'1 =1 ' is classic example of SQL injection attack. For the authentication some PHP GUI saves the user id and password in database. Generally a query something like this is used to validate the user given information:

SELECT * FROM users
WHERE user=''
AND passwd=''

A simple hacker like me ;-) can use SQL injection attack by specifying
User: Any
Password: OR 1 =1

This will allow me to give access to the site. Depending on the query you may need to try other variations like

Password: ') OR ('1=1')

The idea is to inject 1 =1 (which is true) in SQL statement such that the WHERE clause returns TRUE.

Happy Hacking...

Putty passwordless ssh

putty accepts login and password as command line. So it can be easily used in batch to access machines without giving login and password.

putty host1 -l root -pw

I use it to the server which are build frequently. The problem with the server built frequently is that you cannot exchange keys as the keys will be deleted when the server is built again.

If you are using a linux box then sshpass can also be used for auto SSH.

Here is the batch script for windows lover

@echo off
if %1 == myserver goto myserver
goto default

:myserver
start C:\putty -ssh mercury -l -pw
exit

:default
start C:\putty -ssh %1 -l root -pw
exit

Vim Ctrl-r Ctrl-w

Vim Ctrl-r Ctrl-w can be used to read the word under the cursor. It is useful if you want to edit files under the cursor.

:e \C-v \C-r \C-v\C-w \C-v

I know you can use gf to go the file. But just wanted to do it using one key.:-)

Bind command

bind command can be used to bind your key strokes with the commands. I use it frequently to access my cleartool commands.

after editing a file using vi. You can check the difference with the predecessor or the version tree for the file using key-strokes Alt-d or Alt-t

bind -x '"\M-d"':'cleartool diff -pred -g -options "-b" $_ &'
bind -x '"\M-t"':'cleartool lsvtree -g $_ &'

Handy RPM commands

# Unpackage an ISO file.
rpm2cpio <> | cpio -idmv

# Extracting the scripts from the rpm
rpm -qp --scripts <> >> /tmp/scripts

# Command to find if any of the files delivered by an RPM has changed.
rpm --verify

wdl

GNU working directory list is an open source utlity to easily move between the working directories. You can even set CDPATH to move effectively between the directores. But take care setting CDPATH can also cause make command to fail, if you have a top-level make file which cd into sub-dirs and does a make.

Screen Command

Unix Screen command is an indespensable command. Once you know it you cannot live without it. It is window manager. Just try it and you will find it mind blowing.

A new screen can be created using
screen.

Ctrl-A c - Create new window
Ctrl-A A - Name a window
Ctrl-A " - Show all windows.

Ctrl-A S split window.
Ctrl-A tab to move to the next window.

Putty Title

Putty Title can be easily modified using the function wt.

wt ()
{
echo -n "^[]2;${@}^G"
# In all of these, ^[ is really the "escape" character.
# You put it into a file using vi, by typing control-V and then hitting the Escape key.
# Likewise, ^G is the control-G# character. Again, hit control-V
# then hit control-G
}

The link 'http://www.unix.com/unix-dummies-questions-answers/35518-name-path.html'

VIM: Auto formatting.

Lines can be formatted using

set tw=80
and then the famous gq command.

Word macro to export comments

' This macro will export all the comments in the word doc to a new word doc.
' U can save the word doc as .txt.
' Change the extension to .csv
' Open the doc with excel and u have exported your comments to excel
Sub ExportComment()
Dim s As String
Dim cmt As Word.Comment
Dim doc As Word.Document
For Each cmt In ActiveDocument.Comments
s = s & cmt.Initial & cmt.Index & "," & cmt.Range.Text & vbCr
Next
Set doc = Documents.Add
doc.Range.Text = s
End Sub

Word macro for requirement table

Need word macro to parse a doc and get all the requirements in one table

Word macro for comments

Need word macro to export comments from word into an excel sheet

Indentaion techniques in VIM

Need to explore indenatation techniques in VIM.

MSWORD: Macro to add cross reference

Sub CreateCR()
' CreateCR Macro
' Macro recorded 1/5/2007 by Jay
' This macro converts selection copy to a cross reference - numbered item

Selection.Copy
Dim crossref
crossref = Selection
'MsgBox (crossref)
Dim pNumberedItem
pNumberedItem = ActiveDocument.GetCrossReferenceItems(wdRefTypeNumberedItem) For i = 1 To UBound(pNumberedItem)
'MsgBox (pNumberedItem(i))
If Selection = Trim(pNumberedItem(i)) Then
Selection.InsertCrossReference ReferenceType:="Numbered item", _ ReferenceKind:=wdNumberNoContext, ReferenceItem:= i, _
InsertAsHyperlink:=True, IncludePosition:=False
Exit For
End If
Next i
End Sub

Windows: Adding button to IE

run gpedit.msc
go to Windows Settings InternetExplorerMaintenance
Browser User Interface Browser ToolBar Customizations

MSWORD: Link for creating keyboard shortcuts

http://www.oreilly.com/pub/h/2546

Windows: BookMarkelet to fill taxi requests

javascript:function jay(){var F = document.forms;var x=F[0].PURPOSE; x.options[x.selectedIndex].text='Late Stay';var y=F[0].LOC_TYPE; y.options[y.selectedIndex].text='Plot - 17';F[0].CHARGENO.value = 'STKL002',F[0].TO_PLACE.value='Gurgaon Patel Nagar',F[0].l_tele_no.value='9818203631';} jay();

You can find more information about book markelets from wikipedia

VIM: Auto commenting for function closing braces

You can use the following code to perform auto commenting. Put this in your .vimrc file.
This script will add the following comment after }//
}// end

" abbrevation for doing commenting at end of functin curly bracket end "}"
" use }// to comment the code
iab }// ^[:call CurlyBracket()^MA

function CurlyBracket()
let l:my_linenum = line(".")
let l:linenum = searchpair('{', '', '}', 'bW')
let l:line = getline(l:linenum - 1)
let l:str = strpart( line, 4 )
sil exe ":" . l:my_linenum
sil exe "normal a} // end " . str
endfunction

VIM: vimrc function to set file name

This function replaces the existing file name with the name of the file stored in register %.
The file should have the file name after "Module" word for this function to work properly.

function! ReadFileName()
let l:linenum = search("^// *[Mm]odule","w")
let l:filename = getreg("%")
let l:newline = '// Module : '.filename
sil exe ":call setline( linenum, newline)"
endfunction