How to add proxy on the linux server

example proxy server 10.14.23.223

1. ##ping 10.14.23.223

2. vi /etc/environment
use this command

http_proxy="10.14.23.223:138/"
https_proxy="10.14.23.223:138/"

ftp_proxy="ftp://110.14.23.223:138/"

4. vi /etc/yum.conf
proxy=http://10.14.23.223:138