Pacman script to notify if kernel requires restart is required after upgrade (replace '_' with '/' in filenames)

_etc_pacman.d_hooks_91-check-kernel-version.hook

[Trigger]
Operation = Install
Operation = Upgrade
Operation = Remove
Type = Package
Target = *

[Action]
Description = Checking if kernel requires restart
When = PostTransaction
Exec = /usr/local/bin/check_running_kernel.sh

_usr_local_bin_check_running_kernel.sh

#!/bin/env bash

LINUX=$(uname -r)

if [[ "$LINUX" == *-lts ]]; then
  installed_ver=$(pacman -Q linux-lts | awk '{print $NF}')-lts
else
  installed_ver=$(pacman -Q linux | awk '{print $NF}' | rev | sed 's/\./-/' | rev)
fi

if [[ $installed_ver != "$LINUX" ]]; then
  socket=$(ls /tmp/.X11-unix/* | head -n 1)
  display=":$(ls $socket | sed 's#/tmp/.X11-unix/X##' | head -n 1)"
  user=$(stat -c %U /tmp/.X11-unix/X0)
  uid=$(id -u $user)
  command="DISPLAY=$display DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus notify-send \"$LINUX kernel was upgrade\". \"System requires restart\""
  doas -u $user sh -c "$command"
fi