GammaStep filedialog, which uses 'qarma' to set an specific screen temperature and close the window. Has to be used with a .desktop file pointing to this .sh

GammaStep.sh

#!/bin/bash
menu=("4500" "3500" "RemoveEffect")
answer=`zenity --list --column=Menu ${menu[@]} --title "GammastepColor" --height 200`

if   [ "$answer" = "4500" ]; then

     #We Verify if there is a gammastep process running and if its running, we kill it before applying new temperature:
     processo=$(pidof gammastep)
     
    if [[ -n $processo ]]; then
	   kill $processo
    fi
    gammastep -O 4500

	exit 1
elif [ "$answer" = "${menu[1]}" ]; then

     processo=$(pidof gammastep)
    if [[ -n $processo ]]; then
	   kill $processo
    fi
    gammastep -O 3500
	exit 1
elif [ "$answer" = "${menu[2]}" ]; then

    processo=$(pidof gammastep)
    if [[ -n $processo ]]; then
	   kill $processo
    fi
	exit 1
else
	exit 1
fi

Terminal version (with custom value option):

#!/bin/bash

echo -e "Select the screen temperature : \n1=4500 \n2=3500 \n3=Default \n4=CustomValue(>2000 y <6500)"
read -n 1 -p 'Insert your option:' NUM
echo -e " " 
echo -e "$NUM Has been choosen"

#Verify if gammestep is running:
processo=$(pidof gammastep)


if [ "$NUM" = '1' ]
then
 if [[ -n $processo ]]; then
  kill $processo
 fi
 nohup gammastep -O 4500 >/dev/null 2>&1 &
	sleep 1
elif [ "$NUM" = '2' ]
then
 if [[ -n $processo ]]; then
  kill $processo
 fi
 nohup gammastep -O 3500 >/dev/null 2>&1 &
	sleep 1
elif [ "$NUM" = '3' ]
then
 if [[ -n $processo ]]; then
  kill $processo
 fi
 sleep 1
elif [ "$NUM" = '4' ]
then
 if [[ -n $processo ]]; then
  kill $processo
 fi
 echo 'Insert a temperature value between 2000 y 6500:'
 read VALOR
 
  if ((VALOR >= 2000 && VALOR <= 6500)); then
   nohup gammastep -O $VALOR >/dev/null 2>&1 &
    sleep 1
  else
   echo 'Invalid input, the value should be between 2000 y 6500'
  fi 

else
	echo Nothing has been done.
fi

This can be launched with a custom .desktop file which points to that .sh file:

[Desktop Entry]
Name=GammaStepT
GenericName=
Comment=
Exec=PATH_TO_DIRECTORY/gammastepterminal.sh
Type=Application
Icon=gammastep
Terminal=true