Jamf Pro Extension Attribute to generate random numbers for managed Macs. Macs can be grouped based on their random number range to achieve some random spread in the distribution of a given Jamf Pro object

Randomize Clinical Trial Number.xml

<?xml version="1.0" encoding="UTF-8"?><extensionAttribute>
<displayName>Randomized Clinical Trial Number</displayName>
<description/>
<dataType>number</dataType>
<scriptContentsMac>#!/usr/bin/env zsh&#13;
&#13;
preferenceDomain=""&#13;
if [[ "$preferenceDomain" = "" ]]; then&#13;
  preferenceDomain="com.github"&#13;
fi&#13;
&#13;
seedNumberRotationinSeconds=""&#13;
if [[ "$seedNumberRotationinSeconds" = "" ]]; then&#13;
  echo "Setting default rotation schedule of 30 days"&#13;
  seedNumberRotationinSeconds="2628288"&#13;
fi&#13;
&#13;
seedNumberSpread=""&#13;
if [[ "$seedNumberSpread" = "" ]]; then&#13;
  echo "Setting default seed number spread to 100"&#13;
  seedNumberRotationinSeconds="100"&#13;
fi&#13;
&#13;
&#13;
if [[ -f /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist ]]; then&#13;
  priorSeedDateinSeconds=$(defaults read /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedDateinSeconds)&#13;
  seedDateAgeOutinSeconds=$(/bin/date -v -"$seedNumberRotationinSeconds"S +'%s')&#13;
  if [[ "$priorSeedDateinSeconds" -lt "$seedDateAgeOutinSeconds" ]]; then&#13;
    echo "Endpoint has existed in current seed position for more than the alloted time, rotating"&#13;
    seedNumber=$(echo $((1 + RANDOM % "$seedNumberSpread")))&#13;
    seedDateinSeconds=$(/bin/date +%s)&#13;
    defaults write /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedNumber -int "$seedNumber"&#13;
    defaults write /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedDateinSeconds -int "$seedDateinSeconds"&#13;
    echo "&lt;result&gt;$(defaults read /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedNumber)&lt;/result&gt;"&#13;
  else&#13;
    echo "Endpoint is still valid in current seed position"&#13;
    echo "&lt;result&gt;$(defaults read /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedNumber)&lt;/result&gt;"&#13;
  fi&#13;
else&#13;
  seedNumber=$(echo $((1 + RANDOM % "$seedNumberSpread")))&#13;
  seedDateinSeconds=$(/bin/date +%s)&#13;
  defaults write /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedNumber -int "$seedNumber"&#13;
  defaults write /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedDateinSeconds -int "$seedDateinSeconds"&#13;
  echo "&lt;result&gt;$(defaults read /Library/Preferences/"$preferenceDomain".deviceSeedNumber.plist seedNumber)&lt;/result&gt;"&#13;
fi&#13;
</scriptContentsMac>
</extensionAttribute>