gml2gv:tldr:419be

The command "gml2gv -?" is likely a command line instruction that executes the "gml2gv" program with the "-?" parameter.

Typically, the "-?" parameter or "--help" is used to display a help menu or a brief description of how to use the program. It provides information on the available options, arguments, and syntax of the command.

In this case, "gml2gv" is the name of the program or utility being executed, and "-?" is telling the program to display its help menu. By running this command, you should see a list of available commands, their descriptions, and how to utilize them.