[PLUG] Proxy settings in Linux

[Edmond Rodriguez <erodrig97.list@gmail.com>]

I am sometimes switching from one internet provider to another.
Usually this is easy to do, and all the applications I am using don't
know the difference because the basic network settings remain the
same.

But when I go to a service that requires a proxy, I have to modify
settings in all my applications to use that proxy, then return the
settings back when I go back to a service that uses no proxy.

How can I just change one setting and have all the applications
continue just as they were (without reseting options, without
restarting them, etc...)?  If they were running with providerA, and I
switch to providerB (requiring a proxy *manually* configured), they
will just keep running and working without any intervention.

I guess what I am looking for is a easy way to make the proxy happen
(and quickly changeable) downstream/upstream from the application (no
restarts), so the application knows no difference, and I change it
only in one place.

Something tells me I am going to get a really obvious simple answer?
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