template script for macOS which can run a command as the currently logged in user. https://scriptingosx.com/2020/08/running-a-command-as-another-user/

runAsUser.sh

#!/bin/sh

# template script for running a command as user

# The presumption is that this script will be executed as root from a launch daemon
# or from some management agent. To execute a single command as the current user
# you can use the `runAsUser` function below.

# by Armin Briegel - Scripting OS X
# 
# sample code for this blog post
# https://scriptingosx.com/2020/08/running-a-command-as-another-user/

# Permission is granted to use this code in any way you want.
# Credit would be nice, but not obligatory.
# Provided "as is", without warranty of any kind, express or implied.



# variable and function declarations

export PATH=/usr/bin:/bin:/usr/sbin:/sbin

# get the currently logged in user
currentUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ { print $3 }' )

# global check if there is a user logged in
if [ -z "$currentUser" -o "$currentUser" = "loginwindow" ]; then
  echo "no user logged in, cannot proceed"
  exit 1
fi
# now we know a user is logged in

# get the current user's UID
uid=$(id -u "$currentUser")

# convenience function to run a command as the current user
# usage:
#   runAsUser command arguments...
runAsUser() {  
  if [ "$currentUser" != "loginwindow" ]; then
    launchctl asuser "$uid" sudo -u "$currentUser" "$@"
  else
    echo "no user logged in"
    # uncomment the exit command
    # to make the function exit with an error when no user is logged in
    # exit 1
  fi
}


# main code starts here

# open a website in the current user's default browser

runAsUser open "https://scriptingosx.com"



# other examples

# set a preference
#
# runAsUser defaults write com.apple.dock orientation left

# run an AppleScript command
#
# runAsUser osascript -e 'display dialog "Hello, World!"'

# load a launch agent
#
# runAsUser launchctl load com.example.agent