How to find where an environment variable is defined?

Question

I'm using Ubuntu 16.04 and I cannot unset the http_proxy permanently. Every time I open a terminal window, it is restored to http://127.0.0.1:1080.

I have checked /etc/environment, ~/.profile, ~/.bashrc and the scripts inside /etc/profile.d but find nothing about proxy.

So now I want to know how to find out where-in which file-an environment variable is defined. I mean something like where http_proxy and it prints /etc/blahblah(the path of the file that defines http_proxy).

see http://unix.stackexchange.com/questions/813/how-to-determine-where-an-environment-variable-came-from — Rinzwind, Apr 09 '17 at 07:14
@Rinzwind Thanks! That's what I need. I have flagged my question as a duplicate. — zwcloud, Apr 09 '17 at 07:18
No problem :) I have a bunch of q's like these favorited so it was easy to find. — Rinzwind, Apr 09 '17 at 07:19

score -2 · Answer 1 · edited Dec 19 '21 at 10:10

-2

Just add to .bashrc a line with export http_proxy="<proxy you want to use>". This way each time you will run a new shell, this proxy will be in use, same for https and ftp proxy

edited Dec 19 '21 at 10:10

Community

1

answered Apr 09 '17 at 07:03

darvark

285

But I want to find out in which file http_proxy is defined, not how to define it. – zwcloud Apr 09 '17 at 07:05
In Centos this should be in /etc/bashrc, find similar file in /etc or in /usr. But as far as I know by default this variable is not set in linux, additionally you can check does new user has this variable set to the same value. – darvark Apr 09 '17 at 07:09
I'm using Ubuntu. But thanks for the information. – zwcloud Apr 09 '17 at 07:11

How to find where an environment variable is defined?

1 Answers1