Reads plain text file list of mobile device serial numbers and sends Enable Lost Mode command to each, one at a time.

Enable Lost Mode.bash

#!/bin/bash
 
# server connection information
URL="https://jamfpro.talkingmoose.net:8443"
userName="api-editor"
password="P@55w0rd"

# Lost Mode messaging
lostModeMsg="This iPad has been reported lost. Please help us return it."
lostModePhone="(612) 555-1234"
lostModeFootnote="The following device is being tracked with GPS coordinates"

# path to list of serial numbers
deviceList="/path/to/file.txt"

mobileDeviceList=$( /bin/cat "$deviceList" )

# send Lost Mode command to every device in mobile device list
for aDevice in ${mobileDeviceList[@]}
do
    # get Jamf Pro ID for device
    deviceID=$( /usr/bin/curl -s "$URL/JSSResource/mobiledevices/serialnumber/$aDevice" \
    --user "$userName:$password" \
    --header "Accept: text/xml" \
    --request GET | \
    /usr/bin/xpath '/mobile_device/general/id/text()' )
    
    # API submission command
    xmlData="<mobile_device_command>
	<general>
		<command>EnableLostMode</command>
		<lost_mode_message>$lostModeMsg</lost_mode_message>
		<lost_mode_phone>$lostModePhone</lost_mode_phone>
		<lost_mode_footnote>$lostModeFootnote</lost_mode_footnote>
	</general>
	<mobile_devices>
		<mobile_device>
			<id>$deviceID</id>
		</mobile_device>
	</mobile_devices>
</mobile_device_command>"
    
    # flattened XML
    flatXML=$( /usr/bin/xmllint --noblanks - <<< "$xmlData" )
                    
    /usr/bin/curl -s "$URL/JSSResource/mobiledevicecommands/command/EnableLostMode"\
    --user "$userName":"$password" \
    --header "Content-Type: text/xml" \
    --request POST \
    --data "$flatXML"
   
    echo "Sending Enable Lost Mode Command to Device ID: $deviceID..."
done
 
exit 0

Thanks for sharing.

Note that Big Sur changed the xpath version, which breaks this. Here's an updated version that includes a workaround to check OS version and parse xpath data as needed.