tred:tldr:300d9

The command "tred -?" is typically used in programming or computer science contexts and it is associated with graph theory algorithms.

In this case, "tred" likely refers to a program or utility that performs graph reduction or graph transformation. Graph reduction is a process of simplifying or reducing a graph by removing unnecessary or redundant nodes and edges while preserving the structure and essential properties of the graph.

The "-?" flag or option is commonly used in command-line programs to display the help or usage information for that particular command. So, when you run "tred -?", it would display a brief overview of the "tred" command, its available options, and how to use it correctly.

Overall, this command is used to get help or usage instructions for the "tred" program, which is likely used for graph reduction purposes.