How to set permanent Variable PATH in Linux

a). Through Command Line

Open Terminal and write this command

$ sudo vi /etc/profile

and append PATH export command

Ex. 1). To set JAVA_HOME/PATH for JDK append these two lines and save

export JAVA_HOME=/usr/java/jdk1.6.0_30

export PATH=$PATH:$JAVA_HOME/bin

2). To set JDK PATH only

export PATH=$PATH:/usr/java/jdk1.6.0_30/bin

b) Through GUI

Login as root account(if root account is not active read this blog to activate http://nvnsolution.blogspot.in/2012/02/how-to-make-root-account-in-ubuntu-to.html )

open via text editor /etc/profile file and append PATH export command and save

Ex. to set JAVA_HOME path