proxy-switcher.sh

# using:
# for set proxy:
# $ setproxy 127.0.0.1 8118
# for unset:
# $ unsetproxy

function setproxy() {
    export {http,https,ftp,HTTP,HTTPS}_proxy=http://$1:$2
    export no_proxy="localhost,127.0.0.1,master.cafecluster"
    echo "Proxy variable(http,https,ftp) set to $1:$2"
}

function unsetproxy() {
    unset {http,https,ftp,HTTP,HTTPS,no}_proxy
    echo "Proxy variable(http,https,ftp) is unset!"
}

👍