6 Exit Codes
Apart from issuing a descriptive error message,
attempts to indicate the reason of its termination by its error code.
As usual, a zero exit code indicates normal termination. The table
below summarizes all possible error codes. For each error code, it
indicates its decimal value and its symbolic name from
include/sysexits.h (if available).
Program terminated correctly.
The program was invoked incorrectly, e.g. an invalid option was given, or an erroneous argument was supplied to an option.
The program exited due to some error not otherwise described in this table.
Some internal software error occurred.
An error in the configuration file was detected.
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