Which command is used to check environment variables?

The command used to check environment variables is typically "env." This command is designed to display the environment variables for the current session, allowing users to see which variables are set and their corresponding values.

Additionally, the command "printenv" is another command that lists all environment variables currently in effect for the user. Both "env" and "printenv" effectively output the same information, but "env" does allow for some additional options and flexibility.

While the command "set" does list environment variables, it is more commonly used to display both shell and environment variables, along with functions and shell options. Therefore, it may include more information than the user is looking for if they only want to see environment variables.

The command "export" is used for marking environment variables to be exported to child processes, but it does not display them on its own.

In summary, while "set" provides a wider range of information, "env" is specifically tailored for checking environment variables, making it a more precise choice for that purpose.