I haven't ever heard about open source Search Engine kinda thingy...... :P

Came around this:
The Apache Lucene project develops open-source search software
Apache Lucene

NOOP operator in Bash:

A standard NOOP Operator in bash is colon ":".

Try out:

: echo test or anything :)

[m@root]$ a=1
[m@root]$ b=2
[m@root]$ c=3
[m@root]$ echo $a; : echo $b ; echo $c
1
3

Thanks,

Kailash Chandak

Reference Counting Garbage Collection and Circular Reference in PERL

Found very good link about Memory Management in PERL:

http://www.perl.com/pub/2002/08/07/proxyobject.html

validate if a file is already opened [in perl]

if(tell(filehandle) != -1)
{
//file is already opened ! [as tell returns -1]
}

How to identify driver for a give network interface card.

$/sbin/ethtool -i eth0

where,

eth0 : Name of Network interface card.