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To list the current value of PYTHONPATH, which may be empty, try:
echo $PYTHONPATH
The procedure for setting environment variables in depends on what your default shell is. BASH seems to be the most common, but CSH is also common. You should be able to determine which by running at the command prompt:
echo $SHELL
To create a new environment variable:
export PYTHONPATH=~/Python
To prepend to an existing environment variable:
export PATH=~/bin:${PATH}
The search order may be important to you, do you want ~/bin to be searched first or last? To append to an existing environment variable:
export PATH=${PATH}:~/bin
To make your changes available in the future, add the commands to your ~/.bashrc file.
To create a new environment variable:
setenv PYTHONPATH ~/Python
To prepend to an existing environment variable:
setenv PATH ~/bin:${PATH}
The search order may be important to you, do you want ~/bin to be searched first or last? To append to an existing environment variable:
setenv PATH ${PATH}:~/bin
To make your changes available in the future, add the commands to your ~/.cshrc file.
Open the Control Panel (Start ‣ Control Panel), start the System program. Click the Advanced tab and select the Environment Variables button. You can edit or add to the User Variables.