Hacker's Blog

Thursday, April 19, 2007

Trapping signals (^C and ^Z) in Bash

#!/bin/bash
#Script written by Vaibhav Gupta
#Trapping HUP TERM INT and ^Z in shell.

echo "Process ID = $$";
stty susp "" #Trapping CTRL-Z
trap 'echo "Trapping CTRL-C, TERM and HUP";' HUP TERM INT
echo

echo "Sleeping for some time"
for i in `seq 1 20`; do
sleep 1
echo -n "."
done
echo
stty susp "^Z"

Koool bash Functions

http://www.novell.com/coolsolutions/tools/18639.html

Tuesday, April 17, 2007

Script to exchange ssh keys

 1 #!/usr/bin/perl
 2 use Expect;
 3 #USAGE:  ssh-key-exchange.pl <IP> <USERNAME> <PASSWORD>
 4 
 5 my $ip =  $ARGV[0];
 6 my $login = $ARGV[ 1];
 7 my $password = $ARGV[2 ];
 8 my $private_key='/root/.ssh/id_rsa ';
 9 my $public_key='/root/.ssh/id_rsa.pub ';
10 my $authorisedkeyfile='/root/.ssh/authorized_keys ';
11 my $timeout = 10;
12 my  $aft = new Expect;
13 
14 #Generate the public and private key on the local m/c A 
15 if(!(( -e $public_key ) &&( -e $private_key )))  {
16     print "Generating the Public and Private Key:\n ";
17     @result=`ssh-keygen -t rsa -f /root/.ssh/id_rsa -P "" `;
18     #print @result;
19 }
20 #Copy the file to m/c B 
21 print "Copying Public Key from A to B.\n ";
22 $aft->spawn("scp $public_key  $login\@$ip:/tmp/");
 23 $aft->expect($timeout,[ qr'\? $' ,     sub { my $fh=shift; $fh->send("yes\n"); exp_continue; } ],
 24                       [ 'Password: $',sub {  my $fh=shift;$fh->send("$password \n");exp_continue;}  ],
25 #                      '-re','\# $'     
 26                   );
27 $aft->do_soft_close();
28 
29  
30 #Add Keys to authorised keys in B
31 print " Adding Keys to authorised key in B with IP=$ip,[ $login $password  ] \n";
32 my $aft = new Expect; 
33 $aft->log_file("/tmp/expect_log" ,"w");
34 $aft->spawn( "ssh $login\@$ip") or  die "Cannot ssh to the machine \n";
35  $aft->expect($timeout,[ qr'\? $',      sub { my $fh=shift;$fh ->send("yes\n"); exp_continue; } ],
36                       [  'Password: $',sub { my  $fh=shift;$fh->send("$password\n ");exp_continue;}  ],
37                        '-re', '\# $'
38                   );
39 $aft ->send("touch $authorisedkeyfile\n");
 40 $aft->expect($timeout,'-re' ,'\# $');
41 $aft->send( "cat /tmp/id_rsa.pub >> $authorisedkeyfile\n");
42  $aft->expect($timeout,'-re', '\# $');
43 $aft->send(" exit\n");
44 $aft->do_soft_close();
 45

Monday, November 27, 2006

My New Homepage.

Check my new homepage at http://vaibhav.gupta.googlepages.com/
You can download all the scripts from the given page.
My stumble page http://vaibhav.stumbleupon.com/

Vaibhav.

Friday, November 24, 2006

[perl] Popup window

#!/usr/bin/perl
# written by vaibhav gupta
use Gtk2 '-init';
$x=100;$y=100; #default Cordinates
$blue = 0xffff ;
$label = "Hello there";
$label = $ARGV[0] if $ARGV[0];
$delay = 5 ;
$delay = $ARGV[1] if $ARGV[1];
$x = $ARGV[2] if $ARGV[2];
$y = $ARGV[3] if $ARGV[3];
$blue = $ARGV[4] if $ARGV[4] ;

sub usages {
print "\n $ARGV[0] <label> <delay> <x> <y> <color>\n";
}

$window = Gtk2::Window->new("popup");
$window->set_title("Hello");
$window->signal_connect( destroy => sub {Gtk2->main_quit}) ;
$label = Gtk2::Label->new($label);
$label->modify_fg('normal',Gtk2::Gdk::Color->new(0,0,$blue) );
$window->add($label);
$window->move($x,$y);
#$window->resize(300,30);
$window->show_all();
Glib::Idle->add( sub { Gtk2->main_quit; 0 } );
#$window->begin_move_drag(0,100,100,1);
Gtk2->main;
print `sleep $delay`;

[python] Start Python

#!/usr/bin/python
import sys
import os
import __builtin__

def helloworld():
   print "Dare to Challenge http://www.pythonchallenge.com/"
   print "Hello World\n";
   print "This is system Path : "
   print sys.path #this is search Path
   sys.path.append("this/is/test/path");
   print "This is system Path after appending test path "
   print sys.path
   filename = os.environ.get('PYTHONSTARTUP')
   print filename
   if filename and os.path.isfile(filename):
        execfile(filename)
   li = []
   print "Method of list ", dir(li) # list all the method of list
   info(__builtin__, 20) # gives the list of built in function

#Factorial Function Start
def fact(n):
   if n > 1:
       return n * fact(n-1)
       else:
       return 1
def info(object, spacing=10, collapse=1):
   """Print methods and doc strings.

   Takes module, class, list, dictionary, or string."""
   # note
   methodList = [e for e in dir(object) if callable(getattr(object, e))]
   processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s)
   print "\n".join(["%s %s" %
                   (method.ljust(spacing),
                      processFunc(str(getattr(object, method).__doc__)))
                   for method in methodList])


def datatypes():
   str = "This is a string."
   print str
   dict = {"server":"mpilgrim", "database":"this will be deleted"}
   print "Currnt Dictionary: ", dict # NOte that it printed in a sorted way.
   dict["server"] = "CHANGED"
   dict["uid"] = "added"
   dict["Uid"] = "case sensitive"
   dict[2] = "mixed data"
   dict["mixed"] = 123
   del dict["database"]
   print "Now Dictionary   : " , dict
   dict.clear() # To clear all the contents
   list = ["a", "b", "mpilgrim", "removethis", "example","pop"]
   print "Current List   :" , list
   print "Length of List : ", len(list)
   print "list[-1]   :", list[-1] #"li[-n] == li[len(li) - n]"
   print "Slicing    :", list[1:-1]
   print "Pop Element: ", list.pop()
   list.append("append")
   list.extend(["extend1","extend2"]) #note the arg is a list. Concatenates
   list.insert(2,"inserthere")
   list.remove("removethis");
   list += ["Operators"]
   print "Now List   : ",list
   print "Searching extend1 (first occurence): Found at location ", list.index("extend1")
   print "Found c in list:" , "c" in list
   list = ["1","2"]
   print "List Operator : ", list * 10
   tuple = ("son","mon","tue","wed","thu","fri","sat") # Ordered, fast, But can not be modified
   print tuple
   (a,b,c,d,e,f,g) = range(7)
   print "rnage d = ", d
   #3.6

#Calling main Functions.
helloworld()
#print fact(500)
#datatypes();
#info(list)

""" Notes
---------- and-or Trick ----------

>>> a = "first"
>>> b = "second"
>>> 1 and a or b
'first'
>>> 0 and a or b
'second'
---------- and-or Trick Safely ----------
>>> a = ""
>>> b = "second"
>>> (1 and [a] or [b])[0]
---------- split With No Arguments ----------
>>> s = "this    is\na\ttest"
>>> print s
this   is
a       test
>>> print s.split()
['this', 'is', 'a', 'test']
>>> print " ".join(s.split())
'this is a test'

"""

The Fastest Language

Well,
Though this post is a little digression from what this forum is meant
for. It is really an interesting one because many a times we think

Which language is the fastest?

Considering the same hardware/environments are provided, it will all
depend on how well a compiler/interpreter make use of underlying
hardware/environment to generate native/interpreted code.

In a computer language shootout [Survey]
differrent compiler for different languages tested against their
ability to translate code for Ackermann Function
[Ackermann_function], Fibonacci numbers[Fibonacci_number] and
Tak functions [TAKFunction.html].

I was really happy to see that my favourite compiler gcc rules :-)

-by sbjoshi

Wednesday, September 27, 2006

[Perl] Script to take backups

#!/usr/bin/perl
# Written By Vaibhav Gupta
# vaibhav.gupta@gmail.com
# Modify @FILES_TO_BACKUP @DIRS_TO_BACKUP @FILES_PATH as per your need.

$Directory=`date +%Y%m%d%k%M`;
chomp $Directory; # you know why ?
$HOMEDIRECTORY="~guptav/";
@FILES_TO_BACKUP=(".vimrc",".bashrc","public_html/cgi-bin/index.cgi");
@DIRS_TO_BACKUP=( "cvsroot","public_html/","bin");
@FILES_PATH=("/etc/httpd/conf/httpd.conf");

print "\nCreating directory $Directory\n";
@message = `mkdir $Directory`;

foreach $filename (@FILES_TO_BACKUP) {
@message = `cp $HOMEDIRECTORY$filename $Directory`;
}
foreach $filename (@FILES_PATH) { #Absolute Filename
@message = `cp $filename $Directory`;
}
foreach $dirname (@DIRS_TO_BACKUP) {
@message = `cp -r $HOMEDIRECTORY$dirname $Directory`;
}
@message = `tar -cvzf $Directory.tgz $Directory`;
print @message;

#Vaibhav.

Monday, September 11, 2006

[shell] To find the PPID of a PID and more.

1 #!/bin/bash
2 pid=$1
3 if [ -f "/proc/$pid/stat" ]; then
4 name=`cat /proc/$pid/stat | cut -d" " -f 2`
5 else
6 echo "Not a Valid pid $pid"
7 exit
8 fi
9
10
11 while [ "$pid" -gt "0" ]; do
12 echo -n $pid
13 echo -n [$name]
14 echo -n " --> "
15 name=`cat /proc/$pid/stat | cut -d" " -f 2`
16 pid=`cat /proc/$pid/stat | cut -d" " -f 4`
17 done
18
19 echo "0"
20

-Vaibhav

Writing Kernel Modules for 2.6

hello.c
1 #include <linux/module.h>
2 #include <linux/kernel.h>
3
4 int init_module(void)
5 {
6 printk(KERN_INFO "Hello world \n");
7 return 0;
8 }
9
10 void cleanup_module(void)
11 {
12 printk(KERN_INFO "Goodbye world \n");
13 }

Makefile
1 obj-m += hello.o
2
3 all:
4 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
5
6
7 clean:
8 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
9 fresh: clean all

Commands:

Install Module# insmod hello.ko
Remove Module # rmmod hello.ko
Module info # modinfr hello.ko
List Module # lsmod
Check Log # tail /var/log/messages

Files :
/proc/modules | List of modules |
/proc/kallsyms | List of Symbols |

Vaibhav.

Sunday, July 02, 2006

[c++] Source code to find Prime numbers < n+1

/*Code is written by Vaibhav Gupta*/

int prime(int n){

bool *prime = new bool[n+1];
int i;
for(i=0;i<n+1;i++){
prime[i] = true;
}
prime[0]=false;
prime[1]=false;
int m = (int)sqrt((float)n);

for (i=2; i<=m; i++)
if (prime[i])
for (int k=i*i; k<=n; k+=i)
prime[k]=false;

for (i=0; i<n+1; i++){
if (prime[i]) cout << i << " ";
}
cout << endl;
return 0;
}

Tuesday, June 20, 2006

[ebooks] Over 1 billion ebooks.......

Hi friends,

Some sites may not be working.....

http://www.freebookzone.com/
http://en.wikipedia.org/wiki/E-book

ftp://194.105.193.56/pub/warez/books/os/
ftp://194.85.35.67/BOOKS/
ftp://193.231.20.1/pub/books/
ftp://218.104.214.138/4tF/2003/Xmas/
fxp://fxp.runnet.ru/BOOKS - flashget
ftp://se-lab-server.ddns.comp.nus.edu.sg/ebooks/
http://sleekfreak.ath.cx:81/books/
http://preterhuman.net/texts/
http://www.waneesoft.net/books/
http://www.itcertifer.com - www.itcertifer.com
http://cgdn.net/books/
http://www.nerd-star.com/books/
http://publib-b.boulder.ibm.com/Redbooks.nsf/redbooks/
http://classics.mit.edu/Browse/index-Homer.html
http://www.cybersecurity.com.br/Livros/
http://amitmathur.8m.com/ebooks.html
http://mail.stibanas.ac.id/ebooks/
http://www.wolfgarten.com
http://johnny.ihackstuff.com
http://www.law.fsu.edu
http://mail.stibanas.ac.id/ebooks
http://www.comms.scitech.susx.ac.uk/fft/
http://www.cadforum.cz/cadforum_en/default.asp http://en.fixdown.com/eall_1.htm
http://en.fixdown.com/download.asp?id=1658...589&soft=sxdown
http://en.fixdown.com/download.asp?id=1588...886&soft=kldown
http://en.fixdown.com/download.asp?id=1588...886&soft=fjdown
http://en.fixdown.com/download.asp?id=1588...886&soft=bjdown
http://preterhuman.net/texts/
http://www.eicage.org/eicage.asp
http://bjxebook.myetang.com/pc.html
http://www.about-flash.com/
http://docs.rinet.ru:8080/DEFAULT.HTML
http://www.bsmooth.de/BSolutions/
http://newdata.box.sk/raven/books.html
http://www.maththinking.com/boat/computerbooks.html
http://dhruvaraj.150m.com/
http://podgoretsky.pri.ee/ms.html
http://www.comms.scitech.susx.ac.uk/fft/
http://www.intelinfo.com/free_computer_books.html
http://www.e-book.com.au/freebooks.htm
http://www.mcsedirectory.com/books.shtml
http://www.gorkhali.com/kamal/download.htm
http://www.winnetmag.com/windowsnt20002003faq/
http://www.2000trainers.com/
http://www.w3schools.com/
http://members.rogers.com/thekickman/ebooks.htm
http://www.techtutorials.com/Applications/
http://sunsite.iisc.ernet.in/virlib/
http:// www.bdsoft.com/links.html
http://www.python.org/doc/
http://www.graphic-design.com/Photoshop/
http://bjxebook.myetang.com/pc_ebooks/db.htm
http://neworder.box.sk/box.php3?gfx=neword...0Unix%20systems
http://www.exameware.com
http://www.comms.scitech.susx.ac.uk/fft/
http://rahmat.zikri.com/books.html
http://freebooks.by.ru/
http://www.mindview.net/Books/DownloadSites
http://www.maththinking.com/boat/computerbooks.html
http://docs.rinet.ru:8080/
http://www.ebone.at/files.php?show=Books
http://www.empowermentzone.com/#unix
http://skaiste.elekta.lt/Books/
http://content.443.ch/pub/
http://www.ods.com.ua/index.phtml
http://kavosh.irost.net/books/library.htm
http://stommel.tamu.edu/~baum/programming.html
http://digital.library.upenn.edu/books/
http://zikri.indoglobal.com/books.html
http://www.greylib.align.ru/index.html
http://www.itcertifer.com/en/download/default.asp
http://www.lib.ru
http://lib.km.ru
http://aldebaran.ru
http://lib.bigmir.net
http://books.myweb.ru
http://book.pp.ru
http://www.biglib.com.ua/
http://www.lib.com.ua/
http://www.bestlibrary.ru/
http://www.citforum.ru/
http://i2r.rusfund.ru/
http://www.yaxoo.com/books/
http://docs.gets.ru/
http://bookz.ru/
http://www.bestbooks.ru/
http://leoslibrary.on.to/
http://www.bomanuar.ru/
http://molbiol.ru/review/index.html
http://lib.rin.ru/
http://www.bomanuar.ru/
http://www.voronezh.net/library/
http://www.xnt.info/category.php?all=44&start=5&id=9
http://www.emc.maricopa.edu/faculty/farabe...BioBookTOC.html
http://netfoo.net/unix_iso/unixbook.iso
http://maui.fornex.net/e-book/pdf-books/
http://books.dimka.ee/ - HUGE COLLECTION
http://cgdn.net/books/ - Game Programming
http://www.whitefreespeech.com/sub/TurnerDiaries.pdf
http://www.solargeneral.com/library
http://classics.mit.edu/Browse
http://www.nerd-star.com/books/
http://web.starman.ee/winxp/Windows%20XP%2...nside%20Out.rar
http://www.comms.engg.susx.ac.uk/fft/
http://www.vdr-era.cjb.net/documentos/
http://devsaa.narod.ru/books
http://www.ibiblio.org/obp/electricCircuits
http://www.highend3d.com/artists/artist.3d...=yinako&iid=197

http://narod.yandex.ru/cgi-bin/yandmarkup?...og=0x2757571A&H
ndlQuery=757312448&PageNum=0&g=0&d=0&ag=host&tg=1&q0=54598832&p=

http://onlinebooks.library.upenn.edu/webbi...le=&tmode=words

http://macbeht.narod.ru/bucher.htm
http://www.pcworld.com/resource/PDF/circ_2.asp
http://www.emc.maricopa.edu/faculty/farabe...BioBookTOC.html
http://netfoo.net/unix_iso/unixbook.iso
http://maui.fornex.net/e-book/pdf-books/
http://books.dimka.ee/
http://www.click-now.net/ebooks.htm
http://www.baen.com/
http://www.ebookmall.com/ebook/5613-ebook.htm
http://etext.library.adelaide.edu.au/
http://www.freebooks4doctors.com
http://gutenberg.net/cgi-bin/search/t9.cgi
http://gutenberg.net/gutenberg/find.shtml
http://freetechstuff.netfirms.com/dotnet/books.htm
http://www.soldierx.com/books/ACTIVEX_PROG...SHED/index.html

http://www.soldierx.com/books/CHARLIE_CALV...SHED/index.html

http://www.strath.ac.uk/IT/Docs/Ccourse/
http://www.brpreiss.com/books/opus4/html/book.html

http://onlinebooks.library.upenn.edu/webbi...le=&tmode=words

http://www.xatrix.org/index.php
http://www.fintech.ru/Library/prog/Getstrt...DB/getstart.htm
http://www.commandprompt.com/ppbook/
http://www.vijaymukhi.com/documents/books/...oap/xmlsoap.htm
http://www.vijaymukhi.com/documents/books/wap/wap.html
http://www.vijaymukhi.com/documents/books/...sp/javajsp.html
http://www.vijaymukhi.com/documents/books/...s/j2me/j2me.htm
http://www.vijaymukhi.com/documents/books/...s/j2me/j2me.htm
http://www.vijaymukhi.com/documents/books/...cs/csharp1.html
http://www.vijaymukhi.com/documents/books/...dv/csharp2.html
http://www.vijaymukhi.com/documents/books/...vbnet/vbnet.htm
http://www.vijaymukhi.com/documents/books/...ta/metadata.htm
http://www.vijaymukhi.com/documents/books/...net/content.htm
http://www.vijaymukhi.com/documents/books/...2net/vs2net.htm
http://www.vijaymukhi.com/documents/books/...et1/aspnet.html
http://docs.rinet.ru/Cold/
http://www.syncfusion.com/FAQ/WinForms/default.asp#86

http://www.ssuet.edu.pk/~amkhan/cisco/(ebo...ching/Table.htm

http://www.blindprogramming.com/
http://ssuet.edu.pk/taimoor/books/1-57521-...163-7/index.htm
http://www.manastungare.com
http://world.std.com/obi/
http://www.itebooks.net/onlineebooks/Networking.html
http://www.itebooks.net/onlineebooks/Certi...tification.html
http://www.itebooks.net/onlineebooks/Opera...ingSystems.html
http://www.itebooks.net/onlineebooks/Enterprise.html
http://www.itebooks.net/onlineebooks/Internet.html
http://www.itebooks.net/onlineebooks/Programming.html
http://www.itebooks.net/onlineebooks/Database.html
http://www.itebooks.net/onlineebooks/Graphics.html
http://www.itebooks.net/onlineebooks/DesktopApps.html
http://www.itebooks.net/onlineebooks/Hardware.html
http://freebooks.boom.ru
http://the-tech.mit.edu/Shakespeare/
http://www.vecpix.com/
http://kristi.erdves.lt/books/
http://www.zionwap.net/books/main.html
http://www.nopayweb.com/computerbook/
http://leon83.com/download/book/FreeBookList.htm
http://www.mslit.com
http://www.python.org/doc/current/tut/tut.html
http://esspc-ebooks.com
http://en.fixdown.com/eall_3.htm
http://www.xnt.info/category.php?id=9
http://www.bluesfear.com/v5.php
http://www.teamphotoshop.com/photoshop/tut...ials/ps_tut.php
http://www.80four.co.uk/tutorials/photoshop.html
http://www.eyesondesign.net/pshop/tuts.htm
http://www.good-tutorials.com/
http://www.grafx-design.com/tutorials.html
http://myjanee.home.insightbb.com/tutorials.htm
http://www.photoshoproadmap.com/photoshop- ...rials-tips.html
http://rainworld.com/psworkshop/

http://131.128.51.37/se-lab-server.ddns.....edu.sg/ebooks/
http://www.et.utt.ro/public/Docs/
http://www.docs.rinet.ru
http://www.tutorialized.com
http://books.malonus.com/ebooks/computer_science/
http://www.intersoftlb.com/blog4.aspx (mcsd books)
http://131.128.51.37/se-lab-server.ddns.....edu.sg/ebooks/
(nice)(electronic...computer)
http://www.et.utt.ro/public/Docs/
http://www.docs.rinet.ru
http://www.tutorialized.com
http://books.malonus.com/ebooks/computer_science/ (nice)
http://cip.uni-trier.de/jia/links/weball.htm
http://www.gorkhali.com/kamal/download.htm
ftp://ftp.runnet.ru/BOOKS/

Happy reading.......

Bye

Tuesday, May 30, 2006

How to set up thinclient in Linux

Thin Client How to by Vaibhav Gupta

How to set up Thintux Server
You need to setup dhcp server and copy thintux folder on the server.
Setting up dhcp server
a. Make dhcpd configuration file :-> /etc/dhcpd.conf
b. Starting dhcpd :-> /etc/init.d/dhcpd start

Configuring dhcpd.conf Manually:-
1. Set subnet,netmask,router and range of IPs.
2. Set Thintux session server address, resolution and color depth.
3. Detailed Information man dhcpd, man dhcpd.conf
4. Get Sample Configuration dhcpd.conf (For Linux)<a
href="thintux/dhcpd.conf" >[dhcpd.conf] </a>

Format of dhcp.conf :-
[code]
#global parameters...
subnet 10.105.0.0 netmask 255.255.128.0 {
# subnet-specific parameters...
range 10.105.13.101 10.105.13.210;
option routers 10.105.1.250;
option THINTUX_SESSION_SERVER "10.105.11.23";
option THINTUX_SCREEN_RESOLUTION "800x600";
option THINTUX_SCREEN_COLOR_DEPTH "8";
}
group {
#group-specific parameters...
host abc.iitb.ac.in {
#host-specific parameters...
}
}
[/code]
Configuring using config-dhcpd :-
1. http://config-dhcpd.sourceforge.net/

Start X Display Manager
1. vim /usr/X11R6/lib/X11/xdm/xdm-config
2. Comment the last line as below :-
!DisplayManager.requestPort: 0
3. Save and Exit
4. vim /usr/X11R6/lib/X11/xdm/Xaccess
5. uncomment the following line (By removing #)
#* #any host can get a login window
6. Save and Exit
7. Start xdm :-> xdm

Help and Debug :-
1. man xdm
2. Error Logs :-> /var/log/xdm-errors
or :-> /usr/X11R6/lib/X11/xdm/xdm-errors
3. X -query 10.105.11.23

Check tftp is enable on server
1. vim /etc/xinetd.d/tftp
2. Change the disable option to "no" as Below.
disable = no
3. Save file and exit
4. Restart xinitd

Copy /thintux folder in /tftboot on server
<a href="thintux/thintux.tgz" >[thintux][tgz] </a>

http://thintux.sourceforge.net/

How to setup thinclient
Client already contaning Linux OS
1. Copy "localdsk" as /root/thinlinux on Client <a
href="thintux/localdsk" >[localdsk][x86 boot sector] </a>
2. Modify /etc/lilo.conf
3. Run lilo
4. Restart the PC

Add following Entries to lilo.conf:-

default=thin-linux # Add or Modify this line for default Booting from N/w
image=/root/thinlinux
label=thin-linux
read-only

Client that doesnot contain Linux OS
For all the following steps you have to use Dos Bootable Floopy
containg fdisk, format, syslinux.com and linux image(thintux) [as
downloaded above].

1. Delete all partitions on Hard Drive using fdisk.
2. Execute :-> fdisk /mbr
3. Create 20MB Dos Partion and Make active
4. Reboot
5. Execute:-> Format C:
6. Execute:-> syslinux c:
7. Execute:-> copy linux c: The above file "linux" is same as "localdsk". Only the name is
changed in this case.
8. Remove Floppy and Reboot

For Debugging
1. Use tcpdump as
tcpdump -n port 7100
tcpdump -n port tftp

Links
http://thintux.sourceforge.net
http://www.dhcp.org
http://www.dhcp-handbook.com/dhcp_faq.html
http://syslinux.zytor.com
http://www.vlug.org/vlug/meetings/X-terminal_presentation/overview.html

C++ Programs [Interview]

Find the number which is odd number of times? [Interview]
Dated: Wed Dec 28 22:44:42 IST 2005

14 int findodd(int *n,int len)
15 {
16 int num=0;
17 for(int i=0;i<len;i++)
18 num^=n[i];
19 return num;
20 }

How would u sort of 0s and 1s in just single pass? [Interview]
Dated: Wed Dec 28 22:27:42 IST 2005

1 void sort_01 (int *n,int len)
2 {
3 int i=0,j=len-1;
4 while(1){
5 while((!n[i])&&(i<len)) i++;
6 while((n[j])&&(j>-1)) j--;
7 if(i>=j) break;
8 n[i]=~n[i]&1;
9 n[j]=~n[j]&1;
10 i++;j--;
11 }
12 }

Find all possible splits for any given number n. [Interview]
Dated: Wed Dec 28 21:33:48 IST 2005

Init : int array[5]={0,0,0,0,0};
Function Call : split(array,5,0);

1 void split(int *n,int count,int len)
2 {
3 if(count==1) {
4 int i;
5 for(i=0;i<len;i++)
6 printf("%d+",n[i]);
7 printf("%d\n",n[i]+1);
8 return;
9 }
10 else {
11 n[len]+=1;
12 split(n,count-1,len);
13 split(n,count-1,len+1);
14 n[len]-=1;
15 }
16 return ;
17 }

WAP to check a integer (as binary string) is pallindrome? [Interview]
Dated: Wed Dec 28 18:27:43 IST 2005

1 bool panlindrome(unsigned long i)
2 {
3 if(!(i&1)) return false;
4 unsigned long t=i,rev=1;
5 t>>=1;
6 while(t) {
7 rev<<=1;
8 if(t&1) rev |=1;
9 t >>=1;
10 }
11 if(rev==i) return true;
12 return false;
13 }

Find the number of ones in an integer? [Interview]
Dated: Wed Dec 28 18:17:14 IST 2005

1 unsigned noofone(unsigned long i)
2 {
3 int count=0;
4 while(i) i=i&(~(i&(~i+1))),count++;
5 return count;
6 }

WAP to convert a given integer to octal number? [Interview]
Dated: Wed Dec 28 17:45:04 IST 2005

1 #include<stdio.h>
2 void int2octal (unsigned long i)
3 {
4 if(i) {
5 unsigned long o = i&7;
6 i>>=3;
7 int2octal(i);
8 printf("%d",o);
9 }
10 else printf("0");
11 }

How to reverse a singly-linked list? [Interview]
Dated: Tue Dec 27 06:49:35 IST 2005

1 node* reverse_list(node *list)
2 {
3 node *rev=NULL;
4 while(list !=NULL) {
5 node *t = list->next;
6 list->next = rev;
7 rev = list;
8 list = t;
9 }
10 return rev;
11 }