simply to install realtimetrafficd

realtimetrafficd-install.sh

#!/bin/bash
DOWNLOAD_URL="https://github.com/longsleep/realtimetraffic/releases/download/v0.2.0/realtimetrafficd-v0.2.0_amd64"
BIN_DST_DIR=/usr/local/bin
RUNNING_LISTENER=0.0.0.0:8006

function check_error() {
    if [ $? == 1 ]; then
        echo $1
        exit 1
    fi
}

function install() {
	wget -O ${BIN_DST_DIR}/realtimetrafficd $DOWNLOAD_URL
	check_error "download binary error!"
	chmod +x ${BIN_DST_DIR}/realtimetrafficd
	cat << EOT > /etc/systemd/system/realtimetrafficd.service
[unit]
Description=realtimetrafficd
Wants=network.target
After=syslog.target network-online.target
[Service]
Type=simple
Environment=GOGC=20
ExecStart=${BIN_DST_DIR}/realtimetrafficd -listen ${RUNNING_LISTENER}
Restart=on-failure
RestartSec=10
KillMode=process
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOT
	systemctl enable --now realtimetrafficd
	clear
	echo "running on ${RUNNING_LISTENER}"
}

function remove() {
	systemctl stop realtimetrafficd
	systemctl disable realtimetrafficd
	rm -rf /etc/systemd/system/realtimetrafficd.service
	rm -rf ${BIN_DST_DIR}/realtimetrafficd
	clear
	echo "remove finished!"
}

function help() {
    cat << EOF
    realtimetrafficd install helper!!!
    usage: 
    ./realtimetrafficd.sh menu
    install: install realtimetrafficd
    remove: remove realtimetrafficd
EOF
}

function main() {
    if [ $# -lt 1 ]; then
        help
    else
        case $1 in
            install)
                install
            ;;
            remove)
                remove
            ;;
            *)
                echo 'command not found!'
                help
            ;;
        esac
    fi
    exit 0
}

main $@