tunnel.sh

#!/bin/bash

# account and host name of the remote server
VAR_HOST=account@host
# session name used in screen
VAR_SESSION_NAME=tunnel
# forwarding port
VAR_PORT=9999

stop () {
    screen -S "$VAR_SESSION_NAME" -X quit 2> /dev/null
}

start () {
    screen -S "$VAR_SESSION_NAME" -d -m ssh -D "$VAR_PORT" "$VAR_HOST" 'while true; do date; sleep 60; done'
}

main () {
    local action=start
    if [ -n "$1" ]; then
        action="$1"
    fi

    case "$action" in
    start)
        stop
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        start
        ;;
    *)
        echo 'unknow action'
        ;;
    esac
}

main "$@"