

To set the proxy environment variables to apply to all the system users or persistent across all shells, you can append these lines to /etc/environment.

Setup Squid Proxy Authentication on Ubuntu 18.04/Fedora 29/28/CentOS 7
#How To Install Paros Proxy In Ubuntu how to
How to Install and Configure Squid Proxy on Fedora 29/Fedora 28/CentOS 7 Hey, you want to learn how to configure Squid proxy and Squid Proxy authentication on CentOS 7/Fedora 29? Check the links below

Note that the export command sets temporarily environment variables that are only persistent on the shell you created the variable and the user who created the variable. Hence to set http or https proxy environment variables, use the export command.
