Gawk/Extension-Version-String
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17.4.5.3 Registering An Extension Version String
You can register a version string that indicates the name and
version of your extension with gawk, as follows:
void register_ext_version(const char *version);- Register the string pointed to by
versionwithgawk. Note thatgawkdoes not copy theversionstring, so it should not be changed.
gawk prints all registered extension version strings when it
is invoked with the --version option.