Can Admin Accounts Access Other Admin Accounts on macOS?

This is what I came up with:

It also uses http://magervalp.github.io/CreateUserPkg/

#!/bin/bash
# This script will first check existing accounts for presence of USERNAME or admin    or administrator
# If found, it will change the password to PASSWORD
# If none are found, it will run the package create_USERNAME-1.0.pkg which creates an account with Full Name = Administrator, Account Name
# (short name) USERNAME with the password.

function checkusername () {

local test1=$(dscl . -list /Users | grep -i USERNAME)
local test2=$(dscl . -list /Users | grep -i admin)
local test3=$(dscl . -list /Users | grep -i Administrator)

if [ "$test1" = “username” ]; then
  echo the username username already exists
  echo setting password
  dscl . passwd /Users/username PASSWORD
  exit 
else 
  echo
fi

if [ "$test1" = "Username" ]; then
  echo the username Username already exists
  echo setting password
  dscl . passwd /Users/Username PASSWORD
  exit 
else
  echo 
fi

if [ "$test1" = “UserName” ]; then
  echo the username UserName already exists
  echo setting password
  dscl . passwd /Users/UserName PASSWORD
  exit
else 
  echo
fi

if [ "$test2" = "admin" ]; then
  echo the username admin already exists
  echo setting password
  dscl . passwd /Users/admin PASSWORD
  exit 
else 
  echo
fi

if [ "$test2" = "Admin" ]; then
  echo the username Admin already exists
  echo setting password
  dscl . passwd /Users/Admin PASSWORD
  exit 
else 
  echo
fi

if [ "$test3" = "Administrator" ]; then
  echo the username Administrator already exists
  echo setting password
  dscl . passwd /Users/Administrator PASSWORD
  exit 
else 
  echo
fi

if [ "$test3" = "administrator" ]; then
  echo the username administrator already exists
  echo setting password
  dscl . passwd /Users/administrator PASSWORD
  exit 
else 
  echo
fi


}

checkusername

/usr/sbin/installer -pkg 'create_USERNAME-1.0.pkg' -target / 

First of all you may need to unhide the hiden files so open terminal and run those commands :

defaults write com.apple.finder AppleShowAllFiles TRUE

killall Finder

To switch back, do the same but substitute FALSE for TRUE.

Now Login to your guest account, there set chrome as your default browser (or even Firefox) Then do not logout ! This would erase your session, so use the on the top right corner use the swich user drop down menue, Now that you are back again in your Admin account, Find the new temporary guest home folder, under

 Users/Guest

Select all the folders inside of it, And copy them in :

 /System/Library/User Template/English.lproj/    

English or whatever your languish is if you are using your computer in french this should be :

  /System/Library/User Template/French.lproj/    

as you can see in this folder there was the defaults folders for the guest account By modifying them you have just modified default appearance of the guest user account You may want to save this folder in a safe place before, in case you want to undo your work.

For reference , You just have to follow the steps as shown in this video :

https://www.youtube.com/watch?v=JU-W2-_c5bA

Or if you prefer text version :

http://www.michaelsmac.com/modules.php?name=News&file=article&sid=394