I was installing JDK7 on Ubuntu 12.04 by following the guide posted on web8. The commands posted in the guide were:

sudo mkdir -p  /usr/lib/jvm/ #just in case

sudo mv java-7-oracle/ /usr/lib/jvm/

sudo add-apt-repository ppa:nilarimogard/webupd8

sudo apt-get update

sudo apt-get install update-java

sudo update-java

Till here everything went well. So hopefully jdk was installed correctly, but then when I tried to check the java version with the command:

java -version

...it gave me this error:

bash: /usr/bin/java: Permission denied

Yes i know this is a permission related issue. And it can be solved using the sudo command, but can someone tell the exact command? I also checked permissions using ls -l command and the output was:

-rw------- 1 ankit ankit   5650 Jun 27  2011 java  

-rw------- 1 ankit ankit   5805 Jun 27  2011 javac

None of the tutorials and videos i saw were having this issue why is it only me?have i messed up with some default configurations? do i need to change the permission to the /usr/ directory evrytime?

I know this may sound stupid to many here, but i really want to know exactly where I am going wrong.