#!/bin/bash

GPSDEV=/dev/ttyUSB0



startstop() {
    DO=$1

    echo "\$GPS_${DO^^}" > $GPSDEV

    if [ $? -eq 0  ];
    then
        echo -e "[ \e[01;32mOK\e[0m ]\tGPS $DO"
    else
        echo -e "[ \e[01;31m!!\e[0m ]\tSomenthing went wrong. Cannot $DO GPS"
        exit 1
    fi
}


if [ ! -w $GPSDEV ];
then
    echo $"Current user $(whoami) doesn't have permission to write to ${GPSDEV}. Please add it to the 'dialout' group."
    exit 1
fi


case "$1" in

'start' | 'stop')
    startstop $1
    ;;
*)
    echo $"Usage: $0 [start|stop]"
    exit 1 ;;
esac