edit: crap you need the set the desktop instead..

try below script?

i vaguely remember that you need to run sudo killall cfprefsd to apply the changes.

#!/bin/sh



# grab current user

curUser=`ls -l /dev/console | cut -d " " -f 4`



# grab the system's uuid

if [[ `ioreg -rd1 -c IOPlatformExpertDevice | grep -i "UUID" | cut -c27-50` != "00000000-0000-1000-8000-" ]]; then

    macUUID=`ioreg -rd1 -c IOPlatformExpertDevice | grep -i "UUID" | cut -c27-62`

fi



#jamf displayMessage -message $curUser

defaults write /Users/$curUser/Library/Preferences/ByHost/com.apple.screensaver.$macUUID.plist PrefsVersion -int 100



# Use below to deploy custom screensaver

#defaults write /Users/$curUser/Library/Preferences/ByHost/com.apple.screensaver.$macUUID.plist moduleDict -dict moduleName "SOMETHING" path "/path/to/file" type -int 1



chown "$curUser" "/Users/$curUser/Library/Preferences/ByHost/com.apple.screensaver.$macUUID.plist"



sudo killall cfprefsd



#allow all users access to Folder where the Screensaver is

chmod -R 0777 /path/to/file

Maybe I can wrap my AppleScript in your shell script though.
Thanks for the fast reply!

Gabe Shackney
Princeton Public Schools

This should get you what you're looking for.

#!/bin/sh



picLoc="/Path/To/Your/Wallpaper.jpg"

currentUser=$(/bin/ls -l /dev/console | /usr/bin/awk '{print $3}')



#Replace the Current Picture

sudo -u "$currentUser" -H osascript -e "tell application "Finder" to set desktop picture to POSIX file "$picLoc""

@andrew.nicholas
Thanks so much...seems to work perfectly in testing.

Gabe Shackney
Princeton Public Schools

You may want to have a look at the desktoppr tool. Very useful, I deploy it everywhere, much better than dealing with AppleScript intricacies

@guillaumegete This is actually what we are using now and works perfectly. Thanks!

We were using this to great result. Now with the removal of python, it no longer works. We are failing with:

Script result: /Library/Application Support/JAMF/tmp/WGU Wallpaper: line 24: /usr/bin/python: No such file or directory
no user logged in, no desktop set