General :: Git Clone Behind A Proxy Server

I want to clone a linux bridge repository. i'm behind a proxy server.

The command :

gives the following error

I've done
1 - sudo apt-get install socket
2 - in my home directory, a shell script called "proxy-cmd.sh" was created containing #! /bin/bash (echo "CONNECT $1:$2 HTTP/1.0"; echo; cat ) | socket git://MYPROXY 3128 (read a; read a; cat )
3 - chmod +x proxy-cmd.sh
4 - export GIT_PROXY_COMMAND=<PATH TO MY SCRIPT>/proxy-cmd.sh

Still not getting.