adding unset command to bashrc

[john891226]

current unset command doesn't remove current proxy envars forcing to logout because proxyman only removes export sentence and while executing source ~/.bashrc leaves current envar configured

[himanshub16]

Hey @john891226 Thanks for the diff.

The changes look good. I have few concerns and design choices to make

• When a user unsets, no proxy settings are applied in any new terminal tab/window, but those open have the settings in place.
• The user not just expects proxy settings to be removed but also the config files to be cleaned up by removing almost all changes proxyman has done.
• There can be some other script/custom-config setting/updating proxy variable before the unset statements are encountered. The changes in this PR will override (remove) them from any session.

Thus, the user should be able to get rid of proxyman correctly too.

Therefore, during unset, instead of asking user to run source ~/.bashrc, the message during exit can be

# To work without proxy settings, either restart terminal session, 
#  or copy-paste the line below in currently open tabs

for v in `set | grep -i proxy | cut -d\= -f1`; do unset $v; done

What do you think?

[himanshub16]

Closing the PR as it can override with other tools/scripts trying to manage proxy settings apart from ProxyMan. Feel free to comment if you believe otherwise.