4.6 Informative Output

`-h'

`--help'

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

`-v'

`--version'

Prints out the current version number.

`-d'

`--debug'

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.