"! test ..." does not cause the script to fail, even with set -e. IIUC, bash treats this command as part of an expression line, as it would if 'test ... && ...' was used. Failing expression lines do not terminate the script. This fixes the obvious cases by changing '! test' → 'test !'. Then the inversion happens internally in test and bash will propagate the failure.
System and Service Manager
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