creating a user account by command line (terminal)

Here's the script I wrote for this purpose. It's intended to be used by remote ssh login to create new accounts without screen sharing. Obviously the inclusion of a temporary password is not the highest security but users would be instructed to change it ASAP. I would edit the username/password and potentially other options as required. I'd appreciate any feedback.

#!/bin/bash
# Date: Created July 18 2019
# Author: Perry Radau
# Create a new user account on macOS.
# Usage: sudo ./Createuseracct.sh

# Set the Name, Shortname and UID, and password
userPass="mypassword"
testuser="newbie"
#longUser can be a full name including a space e.g. "First Last"
longUser=$testuser
shortUser=$testuser

#Can we find this user? Use grep -w in order to avoid multiple matches from similar usernames.
userCheck=$(dscl . list /Users | grep -w $shortUser)
if [ -z $userCheck ]
then
  echo "Creating user "$shortUser
else
  echo "You are trying to create a user that already exists!"
  echo "Must exit"
  exit 1
fi

#  Auto generates the UID to be the next higher one available among those in the 500 to 509 range.
userID=$(dscacheutil -q user | grep 'uid: 50' | sort | tail -n 1 | awk '{print int($2)+1}')
#Can we find this UID?
uidCheck=$(dscacheutil -q user | grep -w $userID | awk '{print $2}')
if [ -z $uidCheck ]
then
  echo "Using UID "$userID
else
  echo "You are trying to create a UID that already exists!"
  echo "Must exit"
  exit 1
fi

#  gid 20 is staff
groupID=20

# Shutting off iCloud Prompt
defaults write /System/Library/'User Template'/Non_localized/Library/Preferences/com.apple.SetupAssistant DidSeeCloudSetup -boolean YES
# Shut off all warnings about 32 bit applications 'This app is not optimized for the Mac'
defaults write -g CSUIDisable32BitWarning -boolean TRUE

#  Building the dscl command
dscl . -create /Users/$shortUser
dscl . -create /Users/$shortUser UserShell /bin/bash
dscl . -create /Users/$shortUser RealName "$longUser"
dscl . -create /Users/$shortUser UniqueID $userID
dscl . -create /Users/$shortUser PrimaryGroupID $groupID
dscl . -create /Users/$shortUser NFSHomeDirectory /Users/$shortUser
dscl . -passwd /Users/$shortUser $userPass
#Optionally make this an Admin account
dscl . -append /groups/admin GroupMembership $shortUser

echo "Done creating new user "$shortUser" with UID "$userID"."
echo "Please logout and login (not switch) to begin using this account."

exit 0