Proxy setting on Linux

If your Linux box is behind a proxy server then to access the internet, proxy configuration will be required. The 'http_proxy' and 'ftp_proxy' environment variables hold the information about proxy server. Just execute the following commands-

$export http_proxy=http://<proxy-server-ip>:<port>
$export ftp_proxy=http://<proxy-server-ip>:<port>

Now wget, yum, apt-get etc. can use these variables to access http/s and ftp URLs out of office LAN. If proxy server needs authentication credentials then pass them as shown below-

$export http_proxy=http://<user>:<password>@<proxy-server-ip>:<port>
$export ftp_proxy=http://<user>:<password>@<proxy-server-ip>:<port>

To avoid executing these commands every time you login or reboot the machine then add them in ~/.bashrc file.