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This statement results in the script failing.
if [ ! $? == 0 ]; then echo "$(date) | This device is not ABM managed" exit 0; else
Because of the single brackets, ZSH is invoking the history expansion operator
!
instead of performing negation on the exit code check$? == 0
Using the double brackets fixes the problem and the script runs fine:
if [[ ! $? == 0 ]]; then echo "$(date) | This device is not ABM managed" exit 0; else
Double brackets aren't POSIX compliant, but I don't think it matters for this particular script?