Finding the Factorial using Recursion in javascript.

function factorial(x) {
	if(x <= 1) return 1;
	return x*factorial(x-1);
}
factorial(5);

Configure ‘eth0′ in promiscuous mode to gather packets (sniffing)

ifconfig eth0 promisc

Remove a deb package from the system

dpkg -r package_name

Verify the integrity of a rpm package

rpm --checksig package.rpm

Burn an ISO image

cdrecord -v dev=/dev/cdrom cd.iso

Build a rpm package from a rpm source

rpmbuild --rebuild package_name.src.rpm

Command to download a series of urls with zero padding files…

for ((i=1;i<20;i++))
do wget "http://img55.onemanga.com/mangas/00000004/00000000/Naruto-Pilot-`printf "%02d" $i`.jpg"; done
done

Displays linux tasks in a hierarchical mode

ps -e -o pid,args --forest

Find all files with ‘.log’ extention and make an bzip archive

find /var/log -name '*.log' | tar cv --files-from=- | bzip2 > log.tar.bz2

Configure IP Address using the ifconfig command

ifconfig eth0 192.168.1.1 netmask 255.255.255.0