How can most commands on Linux typically display information on their usage?

The correct choice for displaying information on commands in Linux is by running the command in a help mode. Most commands have a built-in mechanism to provide a brief description of their usage and options when invoked with specific arguments. This is often achieved by using options such as -h or --help, which bring up a summary of the command's functionality.

While the option mentioning the man page provides detailed documentation for commands, it is not the typical method for immediate usage information. The man page ('manual page') is often more comprehensive and may not be directly accessed by invoking the command itself. Instead, users would traditionally access the manual pages through the man command followed by the command name.

The method of running a command without any arguments generally does not yield usage information consistently across all commands; some commands may simply execute their primary function without displaying help, leaving the user without guidance.

In summary, while referencing manual pages is important for deep dives into functionality, using help mode is the most common and immediate way to understand command usage in Linux.