how to modify the enviroment varible in Ubuntu

temporary change will gone after the terminal closed

1. Ctrl+Alt+T

2. export PATH=$PATH:{your path}

user level enviroment varible file location

• ~/.profile
• ~/.bash_profile or ~./bash_login
• ~/.bashrc

not recommand to use for the version prior to Ubuntu 10.0

system level enviroment varible file location

• /etc/environment
• /etc/profile
• /etc/bash.bashrc

/etc/profile and /etc/bash.bashrc   not recommend to use fro the version prior to Ubuntu 10.0

open file:

$ sudo nano /etc/profile

append statement:

export PATH="$PATH:/my_new_path"

make it effective immedicately without login again

$source /etc/profile