How to capture all the environment variables from shell?

[Cameron Simpson]

On 26Jul2010 18:36, Peng Yu <pengyu.ut at gmail.com> wrote:
| R_HOME is set in my shell (bash). But os.environ doesn't have it. I'm
| not sure what it does when os module is imported. But it seems that
| os.environ doesn't capture all the environment variable from the
| shell. Could anybody let me know what is the correct way to inherent
| all the environment variables form the shell?
| 
| $ echo $R_HOME
| /opt/R-2.11.1
| $ cat main.py
| #!/usr/bin/env python
| 
| import os
| 
| print os.environ['R_HOME']
| $ ./main.py
| Traceback (most recent call last):
|   File "./main.py", line 5, in <module>
|     print os.environ['R_HOME']
|   File "/opt/Python-2.6.5/lib/python2.6/UserDict.py", line 22, in __getitem__
|     raise KeyError(key)
| KeyError: 'R_HOME'

Sounds like R_HOME is not exported.

Try these in your shell:

  set | grep R_HOME
  export | grep R_HOME

Then, presuming it shows only in the first command:

  export R_HOME

and then try your python script again.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

It is an approved maxim in war, never to do what the enemy wishes you to
do, for this reason alone, that he desires it.  - Napoleon