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source. Usually, the proxy variables are set globally in/etc/environment, but there is no magic - your shell sources/etc/environmentwhen it starts up. Perhaps there are programs that read from/etc/environmentdirectly, but that would depend on the program. Most programs just inspect the variables, I would guess./etc/environment: superuser.com/questions/664169/…. In any case, which programs do you want to configure withhttp_proxy? Perhaps there are other ways to configure them.lynx,curl,wget, etc is much harder. They can't use a PAC or WPAD file. You can't even change the environment variables in a process's parent process, let alone globally. And there's no way to tell a shell to re-source a file when it changes. The only thing you can do is to update/etc/environment(or some other file) and then remember to manually source that file in every shell that needs it.$PROMPT_COMMANDto source a file if it has changed...but that will slow down every shell prompt while it does that. On every command you run. And it won't effect already-running tools, it can only change the *_proxy variables when the prompt is displayed. And it would only work in bash, not ash/dash/zsh/ksh/etc (you could probable use $PS1 in those, but that's an even uglier hack). NOTE:sourceaka.does work in PROMPT_COMMAND...I wasn't sure, so I tested it withPROMPT_COMMAND=". /tmp/pc-test.sh". So, ugly but doable.