Impedir que um terminal aberto seja fechado

Já faz muito tempo, então estou enferrujado com meus comandos.

Eu uso um script para ter lembretes. Um que estou executando exibirá "A chuva de meteoros ocorre depois da meia-noite". depois de 3 horas.

Existe uma maneira de evitar que eu feche acidentalmente um terminal que esteja com meu script de timer em execução?

Atualizar:

Aqui está meu roteiro.

#!/bin/bash
#
#  Sound alarm after specifying time and message 
# Must input time delay AND message in double quotes !!
#
#       
# ** sleep can also accept intergers ex. sleep 7.63
# Made alias for it type al 

    # Print a trace of simple commands, for commands, case commands, select commands, 
    # and arithmetic for commands and their # arguments or associated word lists after they are expanded 
    # and before they are executed. The value of the PS4 variable is # expanded and the resultant value is printed before the # command and its expanded arguments.

Red='\e[0;31m'     
BRed='\e[1;31m' 
BIRed='\e[1;91m' # ${BIRed} this works
Gre='\e[0;32m'     
BGre='\e[1;32m'
BBlu='\e[1;34m' # ${BBlu}
BWhi='\e[1;37m'
Black='\e[0;30' 
BWhite='\e[0m 1;37'
# This defines a variable containing the ANSI escape sequence to clear
# the effect of all previous ANSI escape sequences that define formatting (colors, underlining, etc).
RCol='\e[0m'; 

            

soundfile="/usr/share/sounds/My_Sounds/Alarm_Clock_Sound.mp3"

clear
amixer -D pulse sset Master 40% > /dev/null 2>&1
if [ -f "$soundfile" ];
then
     echo -e "${BGre}Soundfile is present."
else
      
  echo "File $soundfile does NOT exist."
  echo
  echo "Program will now exit."
  exit
fi

[ -z "$2" ] && {
echo 
echo -e " ${BIRed}Error!! No time value given and/or message specified !!"
echo
echo -e "   ${BBlu}Alarm Program 2018 ${RCol}"
echo
echo -e "   alarm.sh [time value in seconds] Message in double Quotes"; 
echo -e "   alarm 5m   = 5 minute alarm"
echo -e "   alarm 5h   = 5 hour alarm"
echo -e "   alarm 5d   = 5 day alarm"
echo -e "   alarm 1.5m = 1 minute 30 seconds alarm"
echo 
echo -e "   alarm.sh 1m "\"Take bread out of oven."\""  

echo 
exit 1; }
echo  -e "\033[32;5mTIMER COUNTING DOWN to $1 \033[0m"
sleep $1
{
    for ((volume = 15; volume <= 35; volume += 2)); do
        # 2> /dev/null suppresses messages for amixer AND (c)vlc
        amixer -D pulse sset Master ${volume}% > /dev/null
        sleep .5
    done
} &

mpg123 $soundfile > /dev/null 2>&1
#set back to original volume
amixer -D pulse sset Master %30

gxmessage -fg blue -font  'sans 20' -timeout 2 ' Tea is ready. !!'