1. Enable Root in Ubuntu
To enable root directory execute the following command in terminal.sudo passwd root
2. Add New User
To add a new user account execute the following command in terminal.sudo adduser username
3. Delete User Account
To delete the user account execute the following command in terminal.sudo deluser username
4. Lock/Unlock the User Account
To lock the user account execute the following command in terminal.sudo passwd -l username
To Unlock the user account execute the following command in terminal.sudo passwd -u username
5. Change Permission for File
chmod is a Unix command that lets you tell the system how much (or little) access it should permit to a file. To change the permission you must login in root using su on terminal.chmod 700 /directory/filename
6. Change Permission for Connection Editor
You can set permission to connection editor using chmod command. To change the permission you must login in root using su on terminal.chmod 700 /usr/bin/nm-connection-editor
You can remove permission for connection editor by executing the following command in terminal.chmod 777 /usr/bin/nm-connection-editor
7. Change Permission for Media
You can set permission to media using chmod command. To change the permission you must login in root using su on terminal. After executing the command all the USB connections are get locked.chmod 700 /media/
You can remove permission for media by executing the following command in terminal.chmod 777 /media/
8. Change Permission for Appearance
You can set permission to appearance using chmod command. To change the permission you must login in root using su on terminal. After executing the following command desktop background cannot be changed in normal user.chmod 700 /usr/bin/gnome-appearance-properties/
9. Change Permission for Screensaver
You can set permission to screensaver using chmod command. To change the permission you must login in root using su on terminal. After executing the following command screensaver cannot be changed in normal user.chmod 700 /usr/bin/gnome-screensaver-preferences/
10. Change Permission for Keyboard
You can set permission to keyboard preference using chmod command. To change the permission you must login in root using su on terminal. After executing the following command keyboard preference cannot be changed in normal user.chmod 700 /usr/bin/gnome-keyboard-properties
The Turnkey Linux Virtual Appliance Library is an open source project developing a free virtual appliance library of pre-packaged servers based on Ubuntu that can be deployed on virtual machines, in cloud computing infrastructures or installed in physical computers.
Each virtual appliance is a ready-to-use solution that's optimized for ease of use in server-type usage scenarios.Each appliance is designed to "just work" with little to no configuration required.
The project currently maintains 40 virtual appliances, which are packaged in multiple build formats:
- Amazon Machine Image: provisioned on-demand via the Amazon Elastic Compute Cloud.
- Virtual appliance: a ready-to-run VMDK disk image with OVF support. Does not require installation.
- Installable Live CD: an ISO image which installs on both bare metal (I.e., a non-virtualized physical machine) and virtual machines, including VMware, Xen, VirtualBox, and KVM. This image can also run live in non-persistent demo mode.
Pre-integrated server applications include LAMP, Joomla, Drupal, WordPress, MySQL, MediaWiki, Domain controller, File server, Ruby on Rails, phpBB, and many others.
Wordpress Themes which provide the SEO Optimization are provided by WOO Themes.Let us take a example of an theme,say Bueno.
Demo
You need to sign up in woothemes.com to download this theme.
Theme Features:
- These are some of the features that you will find within the theme:
- Using a clear & concise grid-based design, Bueno is not only sexy as hell, but very easy to customize;
- Integrated banner ad management
- Widgetized sidebar, with some Bueno-specific custom widgets to allow you full control of what happens in your sidebar
- 7 different colour schemes to choose from
- Theme packaged with a .po file for easy theme translation.
The Indian software industry is set to keep up its growth rate despite the slowdown in the economy. The National Association of Software and Services Companies (Nasscom) has forecast a strong outlook for FY08-09 strong with software and services revenue seen growing by 21-24 per cent. The software and services exports are set to hit the $50 billion-mark.
2. Wipro
What started off as a hydrogenated cooking fat company, Wipro is today is a $5 billion revenue generating IT, BPO and R&D services organisation with presence in over 50 countries.
3. Infosys
Infosys Technologies Ltd was started in 1981 by seven people with $250. Today, the company boasts of revenues of over $ 4 billion and 94,379 employees.
4. Mahindra satyam
Established in 1987 by Ramalinga Raju, Satyam has a staff strength of 51,000 employees. In 2008, the company's revenues crossed the $ 2-billion mark.
5. HCL Technologies
HCL is a leading global technology player with annual revenues of $4.9 billion. The HCL Enterprise comprises two companies listed in India, HCL Technologies and HCL Infosystems. Founded in 1976, HCL is one of 'India's original IT garage start ups'.
6. Tech Mahindra
Tech Mahindra was incorporated as a joint venture between Mahindra & Mahindra and BT plc in 1986 under the name of 'Mahindra-British Telecom'.
7. Patni Computer Systems
Patni Computer Systems Ltd one of the leading global providers of information technology services and business solutions. The company has clients across the Americas, Europe and Asia-Pacific locations.
8. i-flex Solutions
iflex started as a division of Citicorp (now Citigroup), wholly owned subsidiary called Citicorp Overseas Software Ltd. (COSL) in 1991. Later, a separate company Citicorp Information Technologies Industries Ltd. (CITIL) was formed and Rajesh Hukku was appointed as its head.
9. MphasiS
MphasiS Limited was formed in June 2000 after the merger of the US-based IT consulting company MphasiS Corporation (founded in 1998) and the Indian IT services company BFL Software Limited (founded in 1993).
10. L&T Infotech
L&T Infotech is a global IT services and solutions provider. It is a subsidiary company of is Larsen & Toubro Ltd. (L&T), an engineering, manufacturing and construction conglomerate, with global operations.
At TEDIndia, Pranav Mistry demos several tools that help the physical world interact with the world of data -- including a deep look at his SixthSense device and a new, paradigm-shifting paper "laptop." In an onstage Q&A, Mistry says he'll open-source the software behind SixthSense, to open its possibilities to all.
Definition:
Displacement sensor is use to sense and measure the displacement of the object.
Principle:
Light is sent through a transmitting fiber and is made to fall on a moving target.The reflected beam from the target is sensed by a detector with respect to intensity of light reflected from it and hence the displacement of the target is measured.
Construction:
This type of sensor consists of a bundle of transmitting fibers coupled to a laser source and a bundle of receving fibers coupled to a detector as shown below.
Working:
To measure the displacement of the target,first light from the source is transmitted through the transmitting fiber and it is made to fall on the moving target.
The reflected beam from the target is made to pass through the receiving fiber and this light is detected by the detector.The intensity of the light received back depends on the displacement of the target.
If received intensity increases,it indicates thatthe target is moving towards the sensor.But if the intensity of light received inceases,it indicates that the target is moving away from the sensor.
Thus the displacement of the target can be measured from the intensity of the light received.