Which command provides information about environment variables?

The command that provides information about environment variables is indeed "env." When you execute "env," it prints a list of all the environment variables and their current values in the shell session. This is useful for users to quickly view the environment configuration, which is particularly important for applications that rely on certain variables being set.

Using "env" can also be effective in executing another program in a modified environment, where you can temporarily set or change environment variables for that specific command without changing the entire shell session's environment.

While other commands such as "set" and "printenv" can also be used to interact with environment variables, "env" is specifically focused on displaying all environment variables neatly. The command "set" displays all shell variables and functions, not just the environment variables, while "printenv" typically shows only the values of the specified environment variables and could vary between different systems in terms of available options. "showenv" is not a standard command in Linux systems, making "env" the most appropriate and widely recognized of the available choices.