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4.6 Informative Output

Prints a short summary on the meaning of each program option. Aborts further program execution.
Prints out the current version number.
Enables the debugging option. This produces verbose diagnostics to “standard error” when gperf is executing. It is useful both for maintaining the program and for determining whether a given set of options is actually speeding up the search for a solution. Some useful information is dumped at the end of the program when the ‘-d’ option is enabled.