Bash script to make i3 lock activate a timeout of 10 seconds to power down the locked screen

Question

I have tried to make a script that takes a screenshot of current screen, blur it and set it as background of i3 lock screen.In addition I want to activate a timeout of 10 seconds to power down the locked screen.I linked this script with keybinding for i3 lock but the 10 seconds timeout feature is running without i3 lock as well, my screen's power goes down after every 10 seconds of inactivity.
Here is my script:

#!/bin/bash                                                                                                                                                            
                                                                                                                                                                       
                                                                                                                                                                       
img='ss.png'                                                                                                                                                           
                                                                                                                                                                       
scrot "$img"                                                                                                                                                           
                                                                                                                                                                       
convert $img -blur 2,5 $img                                                                                                                                            
                                                                                                                                                                       
                                                                                                                                                                       
i3lock -i $img                                                                                                                                                         
rm $img                                                                                                                                                                
xset dpms 0 0 10  ```

Answer 1

Maybe instead of that xset line, you can write something like

#!/usr/bin/env bash

img='ss.png'                                                                                                                                                                                                                                                                                                                      
scrot "$img"                                                                                                                                                           
                                                                                                                                                                       
convert "$img" -blur 2,5 "$img"                                                                                                                                                                                                                                                                                                                                     
i3lock -i "$img"                                                                                                                                                         
rm -f -- "$img"

has_set_dpms=false
while :; do
  if pgrep i3lock >/dev/null; then
    if [ "$has_set_dpms" != true ]; then
      xset dpms 0 0 10
    fi
    has_set_dpms=true
  else
     # Once the process i3lock cannot be found, we turn off DPMS, or
     # you can reset it to what it was before
    xset -dpms
    exit
  fi

  sleep 5
done

Essentially, it just loops, checking if i3lock is on. If it is (we just launched it), then we do the xset (and use the has_set_dpms variable to make sure we only call xset once in the while loop).

Once the i3lock process does not exist, then we reset the dpms with xset and exit.

Also I thought that i3lock -i "$img" would need to have an & at the end of the line, but I suppose not...