Technical Quiz a.k.a Cyber Quiz

I am hereby starting a series of Quizing sessions to test yours and improving my knowledge, which I left updating since the last 3 years. These quizzes are not compiled by me, instead took from various sources, online and print. At a time the number of questions, wont exceed a max of 20.

So there you go, hovering the mouse over the Answer will give you the answers

1. What is Google's open operating system for mobile phones called ?
   
   
   Answer
   
   
2. Which telecom major is the biggest stakeholder in Symbian Ltd?
   
   Answer
   
   
3. What is 'zoo' in context of security ?
   
   Answer
   
   
4. Nigel Clifford is the CEO of .... ?
   
   Answer
   
   
5. Who has Peter Dengate Thrush replaced as the Chairman of ICANN ?
   
   Answer
   
   
6. What was founded in July 1990 by Mitch Kapor, John Gilmore, and John Perry Barlow ?
   
   Answer
   
   
7. The graphics Processing Unit used in Nintendo's Wii video fame console is called ... ?
   
   Answer
   
   
8. What in the context of Linux is "bash"
   
   Answer
   
   
9. The maximum packet length of IP, including the IP header is ........................ bytes
   
   Answer
   
   
10. What is 'Wardriving' ?
    
    Answer
    

Multiline search and replace using sed

I had to code in to remove a host entry from hosts.cfg file of nagios. Here is a bit of superb code to do so..

sed '/#/{:a;N;/\}/!ba;/212.217.202.112/s/#.*\}//;}' hosts.cfg

That will remove the entire block starting with "# '212.217.202.112' host definition" and ending in "}"

Obfuscated code eh ? Not so..learn about registers in sed!!

How to remove the mails from exim mail queue based on certain keywords ( cPanel specific )

How to remove the mails from exim mail queue based on certain keywords, especially in a cPanel. Below command will help in that and is for cPanel server. Matter of seconds for a seasoned admin, but posting so that I can copy and paste in future.

find /var/spool/exim/input -type f | xargs grep -l 'search_keywords' | xargs rm -frv

mod_rewrite and REQUEST_URI

Yesterday I did a forum move , a SMF forum. We had to move the forum URL from http://www.domain.com/forum to http://www.domain.com along with moving the servers, but still not losing the links spidered by Google. So things had to be achieved by mod_rewrite and the below rewrite rule helped.

RewriteEngine on
RewriteCond %{REQUEST_URI} ^/forum/(.*)$ [NC]
RewriteRule ^forum/(.*)$ /$1 [R=301,L]

What this will do is redirect

http://www.domain.com/forum/index.php?PHPSESSID=0aj813j131434061699fb61eef295f
to
http://www.domain.com/index.php?PHPSESSID=0aj813j131434061699fb61eef295f

Praise the mod_rewrite authors !!!

Forcing the files to be downloaded

Many of us have had to face the issue of making an txt file or .php file downloaded instead of the webserver parsing it and the browser displaying it. A simple entry as below in .htaccess and sometimes in your virtualhost section of httpd.conf can get this done.


Header add Content-Disposition "Attachment"

semget: No space left on device

2 long months of no technical blogging..I have seen and gone through many issues , but hardly remembered about this blog :-(

Situation:

Restarting httpd works for port 80, but fails for 443 (SSL port). I confirmed it with a telnet localhost 443, which returned me connection refused error. Apache error log along with informational messages, was returning me,

semget: No space left on device

Solution :

To understand that is all because of semaphores getting build up and not being cleared properly. So we need to forcefully remove them.

Stop httpd. and issue the following command,

ipcs | grep nobody | awk '{print $2}' > clear.txt
for i in `cat clear.txt`; do { ipcrm -s $i; }; done;

And finally restart httpd. Please note that in the above command I used nobody to grep in ipcs, but in your case it can be apache or www or even www-data. But you know the drill!!!