Awesome post on Install JDK and JRE

http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux

Installing RVM @ Ubuntu

Instructions given on : http://rvm.io/rvm/install

Are badly given. Too much mix and match.

For beginners it might searching for the right thing in an ocean where everything seems similar.

ps: that's a bad one.

Anyways:

Step 1) Insall curl on your machine.

Step 2) Download the stable release version of RVM from rvm.io

\curl -sSL https://get.rvm.io | bash -s stable

Step 3) That's it. Check rvm --version.

and there you go!

Step 4) Well, if it was that straight forward I would not have written this blog.

Step 5) You just need to add a path to your bashrc file.

use 

echo '[[ -s "/home/userName/.rvm/scripts/rvm" ]] && source "/home/userName/.rvm/scripts/rvm"' >> ~/.bashrc

Step 6) Source bashrc file

source ~/.bashrc 




And the most important




Step 7) Check what u have installed:

rvm --version




Step 8) Enjoy!

How to format USB flash drive from terminal

Steps:

1) check the partitions using the command:
$df

2) Take the usb partition name from the list after you run the above command, e.g. /dev/sdb1

3) Un mount the device:
$ sudo umount /dev/sdb1

4) Verify with df whether the device has gone or not

5) Format the USB using the following:

 a) for FAT32(used on Windows systems) use:
    sudo mkfs.vfat -n usbNameWhatEverYouWantToGive /dev/sdb1

 b) For ext3 (used on linux) use:
   sudo mkfs.ext3 -L usbNameWhatEverYouWantToGive /dev/sdb1

Few common errors while installing rails

Problem with pg_config:

Steps for that:
1) sudo apt-install libpq-dev
2) gem install pg


Problem with rmagick:

Steps:
1) sudo apt-get install libmagickwand-dev
2) gem install rmagick.