Proxy com senha

simples

export http_proxy="http://192.168.10.11:8080"
export ftp_proxy="http://192.168.10.11:8080"

no wget

wget --proxy-user "Wonderwall\JohnDoe" --proxy-passwd "Go4It" http://prdownloads.sourceforge.net/archlinux/arch-0.6.iso

export

export http_proxy="http://wonderwall\\johndoe:Go4It@192.168.10.11:8080"
export ftp_proxy="http://wonderwall\\johndoe:Go4It@192.168.10.11:8080"

retirado de "http://wiki.archlinux.org/index.php/How_to_make_wget_to_work_with_proxy_and_proxy_authentification"