Apple - Is there any shortcut/easy way to switch this system proxy settings?
This can be done with networksetup
.
Get all services:
networksetup -listallnetworkservices
Then with the proper service (e.g Ethernet or the name of your USB 10/100/1000 LAN adapter) enter
sudo networksetup -setsocksfirewallproxy <networkservice> <domain> <port number> <authenticated> <username> <password>
or
sudo networksetup -setwebproxy <networkservice> <domain> <port number> <authenticated> <username> <password>
to configure it (which isn't necessary in your case, because you already entered all necessary values).
e.g.
sudo networksetup -setsocksfirewallproxy Ethernet 127.0.0.1 18080
sudo networksetup -setwebproxy Ethernet 127.0.0.1 18080
To simply toggle it on or off use:
sudo networksetup -setsocksfirewallproxystate networkservice on | off
sudo networksetup -setwebproxystate networkservice on | off
e.g.
sudo networksetup -setsocksfirewallproxystate Ethernet off
sudo networksetup -setwebproxystate Ethernet off
man networksetup
will reveal other proxy options (gopher, ftp, etc.)
Use "Locations" under Network Preferences.
Set up a location that has the proxy and then a location that doesn't. When you want to use the proxy, pick that location and your settings will change.