gistfile1.txt

#!/bin/bash


# This script works well for removing local accounts that are older than 1 day. 
# Obviously the 1 day timeframe can be modified (-mtime +1).  

# Runs using Launch Daemon - /Library/LaunchDaemons/edu.org.deleteaccounts.plist
# version .7


DATE=`date "+%Y-%m-%d %H:%M:%S"`

# Don't delete local accounts
keep1="/Users/admin"
keep2="/Users/admin2"
keep3="/Users/Shared"
currentuser=`ls -l /dev/console | cut -d " " -f 4`
keep4=/Users/$currentuser

USERLIST=`/usr/bin/find /Users -type d -maxdepth 1 -mindepth 1 -mtime +1`

for a in $USERLIST ; do
    [[ "$a" == "$keep1" ]] && continue  #skip admin
    [[ "$a" == "$keep2" ]] && continue  #skip admin2
    [[ "$a" == "$keep3" ]] && continue  #skip shared
    [[ "$a" == "$keep4" ]] && continue  #skip current user
    

# Log results
echo ${DATE} - "Deleting account and home directory for" $a >> "/Library/Logs/deleted user accounts.log"
    
# Delete the account
/usr/bin/dscl . -delete $a  
    
# Delete the home directory
# dscl . list /Users UniqueID | awk '$2 > 500 { print $1 }' | grep -v Shared | grep -v admin | grep -v admin1 | grep -v .localized
/bin/rm -rf $a

done 
exit 0

gistfile2.txt

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Disabled</key>
	<false/>
	<key>Label</key>
	<string>edu.org.deleteaccounts</string>
	<key>ProgramArguments</key>
	<array>
		<string>/Library/Scripts/delete-accounts.sh</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>StartCalendarInterval</key>
	<dict>
		<key>Hour</key>
		<integer>7</integer>
		<key>Minute</key>
		<integer>30</integer>
	</dict>
	<key>StartInterval</key>
	<integer>86400</integer>
</dict>
</plist>