Informative Output

`-h'

Prints a short summary on the meaning of each program option. Aborts further program execution.

`-v'

Prints out the current version number.

`-d'

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.

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