@GrahamJ I'm going to guess you are on macOS 12.3.  python was removed in macOS 12.3.  https://www.macrumors.com/2022/01/28/apple-removing-python-2-in-macos-12-3/ 

neat miss on my part

Recommend changing your script to use this command to get the Current User:

currentUser=$( scutil <<< "show State:/Users/ConsoleUser" | awk '/Name && ! /loginwindow/ { print $3 }' )

Recommend changing your script to use this command to get the Current User:

 

currentUser=$( scutil <<< "show State:/Users/ConsoleUser" | awk '/Name && ! /loginwindow/ { print $3 }' )

Still missing something. Still kicking an -name error. 

#!/bin/bash

currentUser=$( scutil <<< "show State:/Users/ConsoleUser" | awk '/Name && ! /loginwindow/ { print $3 }' )
SerialNumber=$(system_profiler SPHardwareDataType | grep "Serial Number" | awk -F':' '{print $2}' | sed -e 's/^[ \\t]*//' -e 's/[ \\t]*$//')

### Set the computer name using the jamf binary

/usr/local/bin/jamf setComputerName -target / -name "$CurrentUser"-"$SerialNumber"

okay, think i got it working.

#!/bin/bash

userName=$(/bin/ls -la /dev/console | /usr/bin/cut -d " " -f 4)
SerialNumber=$(system_profiler SPHardwareDataType | grep "Serial Number" | awk -F':' '{print $2}' | sed -e 's/^[ \\t]*//' -e 's/[ \\t]*$//')

computerName="$userName-$SerialNumber"

# Set the ComputerName, HostName and LocalHostName
/usr/sbin/scutil --set ComputerName "$computerName"
/usr/sbin/scutil --set HostName "$computerName"
/usr/sbin/scutil --set LocalHostName "$computerName"

exit 0

Just remember that device names are broadcast in the clear on any associated network, so it is generally advisable to avoid PII in the device name if at all possible.  If all of your users are adults, it may not be an issue, but would be a HUGE red flag in K12 due to the privacy and safety concerns.  Just my $0.02.