Windows Registry location for Start-up Items

Login to Windows as administrator user. Now type “regedit” in the Run window. Press enter. This will bring the Registry Editor application.
Expand to the following key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
As shown in the screen shot below the key will list the items that will start on logging to windows.You can delete the unwanted entries from the right pane [Please take a backup of registry before dealing with it]

Also you can check one more key
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
This key belongs to that of the current user. From this key also you can delete unwanted entries.
This key is for user specific startup setting while the first one is for machine specific startup setting. The entries under the first one will affect all the users of the system, while the entries under this key will affect only the current user. In our case this is the administrator user of the system

Windows PowerShell 4.0

 

The download link to Windows PowerShell 4.0

http://www.microsoft.com/en-us/download/details.aspx?id=40855

Supported Systems

• Windows 7 SP1
• Windows 2008 R2 SP1
• Windows Server 2012
• Windows Server 2012 R2
• Windows 8.1

What are the new features in PowerShell 4.0 can be found in the following Microsoft TechNet Library Link

http://technet.microsoft.com/en-us/library/hh857339.aspx

Finding Disk Space using command line in Ubuntu

Let see how we can use the “df” command to find the disk space and partitions in Ubuntu
First open a terminal. Now type the command “df –h”. This will show an output as shown in the picture below. Here the option “-h” is used to produce the output in human readable form

 

As you can see the output will have 6 columns. First one is the “Filesystem”, second showing the total size, third the used space, fourth the remaining space, fifth the space usage in percentage and the last column shows where it is mounted.
Now if we want to get the total also just add one more option to the command. The option is “- -total”. Now the command become “df –h - -total”. As shown below it will show the total disk space, total usage, total free and the total usage percentage.

Removing Guest Account from Login screen in Ubuntu

Ubuntu 13.04
As shown below by default the Guest account will be enabled in Ubuntu.

To remove this Guest Account from the login screen, first login to Ubuntu as administrator. Then open the terminal and type the command:

sudo gedit /etc/lightdm/lightdm.conf

This will open the “lightdm.conf” configuration file in gedit application. Now add the following line to the end of the file as shown below:

           allow-guest=false

Now save the file by pressing “Ctrl+S” and close the gedit application. In the terminal type the following command to restart the lightdm service

sudo restart lightdm

This will take you to the login screen. Now there will be no guest account entry on the login screen as shown below

Ubuntu 13.10
Here the file you need to edit is a different one. In the terminal type the following command

sudo gedit /etc/lightdm/lightdm.conf.d/50-unity-greeter.conf

This will open the “50-unity-greeter.conf” configuration file in gedit application. Now add the following line to the end of the file as shown below:

           allow-guest=false

For the rest proceed as mentioned for 13.04

Some Firefox Shortcuts

 

Opening New Tab	Ctrl + T
Opening New Window	Ctrl + N
Making the Menu bar Visible	Alt
Closing a Tab	Ctrl + W or Ctrl + F4
To navigate through tabs forward	Ctrl + Tab
To navigate through tabs backward	Ctrl + Shift + Tab
Closing a Window	Ctrl + Shift + W
Moving Forward	Alt + Right Arrow
Moving Backward	Alt + Left Arrow
Going to Home	Alt + Home
To see the Download Window	Ctrl + J
To Open Firebug (if installed)	F12
To Display the Addons Window	Ctrl + Shift + A
To Bookmark Current Page	Ctrl + D
Viewing or Closing Bookmarks Sidebar	Ctrl + B
Viewing or Closing History Sidebar	Ctrl+H
Reload a page	Ctrl + R
Reload a page ignoring content in the cache	Shift + Ctrl + R
To stop the loading of a page	Esc
Opening a link in new tab	Ctrl + Left mouse button
Adding .com to the end of the address in the address bar	Ctrl + Enter
Adding .org to the end of the address in the address bar	Shift + Ctrl +Enter
Adding .net to the end of the address in the address bar	Shift + Enter