To find Ip address and other information of your machine through terminal

1> open terminal
2>ifconfig

youtube downloader in Ubuntu

1> Go to fire fox add ons and install download helper from here here
2> Install it (by double clicking when saved on pc)
3> Go to view tab -> toolbar ->customize. and then select download helper icon and drag on toolbar.
4> Open you tube and scroll down arrow in download helper it will save the file.

For more click on this video

Moving Window buttons to right on Ubuntu

1> press Alt + F2(function key)
2> type gconf-editor and click run
3> click + button in apps option and then navigate to metacity
4>go to button layout and make changes

refer : here  for more information.

wine

wine is basically used to run windows application on linux.
install wine using sudo apt-get install wine

*goto setup and write wine setup.exe

wget

wget : is a non interactive way of downloading software from web. It supports http, ftp, https protocols as well as retrieval from http proxies.
wget is non interactive means it can run in a background without user logged in.
ex: wget <URL>  on terminal. where URL is the URL of the software package from where it can be downloaded.
various options are also present  (see man wget).
for ex :wget http://www.skype.com/intl/en/get-skype/on-your-computer/linux/

Finding the cpu width

1> Install cpuid by:
           sudo apt-get install cpuid
     cpuid command is also useful for finding various entities about processor.
2> write on terminal :
          sudo lshw
in second or 3rd paragraph with heading cpu 1 (gives the description of cpu like processor name intel core2 duo, and from their we can see width of cpu).

PPA /Personal package archieve

Using PPA we can distribute our own software package to other Ubuntu users, similarly like we download software packages from ubuntu resource. It means ubuntu users can install your software package in the same way as they install standard ubuntu software packages and also receive updates when you make updation to your package.

Package published by you will remain in your PPA untill and unless you remove your package.  Size limit for PPA is 2GB.
1> Firstly you should activate whether your PPA is individual or team PPA. For this you have to do some sort of login in your profile page.
2>After this launchpad generate a key, which is used for package.


** How to install software from PPA ?
1> Visit PPA overview launchpad page and look for heading " Adding this ppa to your system" . Make a note about location which looks like ppa: user/ppa-name.
let us say " ppa: gwibber-daily/ppa
write on terminal : sudo add-apt-repository ppa: gwibber-daily/ppa

2> Your system will now fetch the PPA key.
3> sudo apt-get update
Now you are ready to run sudo apt-get install <sp> (from ppa).


NOTE : Package you are installing from PPA is your own trust towards the publisher.

Useful Links :a>https://help.launchpad.net/FrontPage
                      b>https://help.launchpad.net/Packaging/PPA#keys?action=show&redirect=PPAKeys
                      c>https://help.launchpad.net/Packaging/PPA/InstallingSoftware
                      d>https://help.ubuntu.com/community/Repositories/Ubuntu#Adding%20Repositories%20in%20Ubuntu