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5.6.10 Return information about the process

This is a multipurpose function to return a variety of information.

     GETINFO what

The value of what specifies the kind of information returned:

Return the version of the program.
Return the process id of the process.
Return success if the agent is running.
cmd_has_option cmd opt
Return success if the command cmd implements the option opt. The leading two dashes usually used with opt shall not be given.