Pacnew/Pacsave hook issues

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 omano  ~ $  cat /usr/share/libalpm/scripts/pacnew-check
#!/bin/bash

#Test if pacnew/pacsave are created and create the spy file
/usr/bin/test "$(/usr/bin/pacdiff -o)"

if [[ "$?" -eq "0" ]]; then
    last_user=$(last | head -1 | cut -d' ' -f1) 
    sudo -u $last_user usr/bin/touch /tmp/pacnew-check.file
fi

Here is the target script. It is part of Manjaro Pacnew Checker by @Ste74