System wide proxy

vi /etc/profile.d/proxy.sh 



export http_proxy=http://proxy-server:80/
export HTTP_PROXY=$http_proxy
export https_proxy=$http_proxy
export HTTPS_PROXY=$http_proxy
export ftp_proxy=$http_proxy
export FTP_PROXY=$http_proxy
export no_proxy="localhost,127.0.0.0,127.0.0.1,.localdomain"
export NO_PROXY=$no_proxy


chmod 755 /etc/profile.d/proxy.sh