What Shell Script command displays all of the global variables set in the session?

The command that displays all of the global variables set in the session is the one that utilizes the set command. When executed without any arguments, set lists all shell variables and functions currently defined in the environment, including both global and local variables. This means it provides a comprehensive view of all variables, including user-defined, environment, and shell variables, which is what you need when looking for anything defined in the current session.

On the other hand, commands like printenv and env specifically focus on environment variables. They will not display local shell variables that are not exported to the environment. The echo command is used for displaying strings or values but does not inherently provide a list of variables. Hence, set is the command that correctly fulfills the requirement of displaying all defined global variables in the session.