我常用的bash utils

function proxy() {
    # 获取默认网关 IP
    DEFAULT_GATEWAY=$(ip route show | grep default | awk '{print $3}')
    # 默认代理服务器为默认网关 IP，默认端口为 7891
    SERVER=${2:-$DEFAULT_GATEWAY}
    PORT=${1:-"7891"}
    export http_proxy="http://$SERVER:$PORT"
    export https_proxy="http://$SERVER:$PORT"
    echo "proxy is set to $SERVER:$PORT"
}

function unproxy() {
    unset http_proxy
    unset https_proxy
}