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The `env` command can be used to display the current environment variables by running the command without any arguments. For example, running `env` in a terminal will display a list of all the environment variables and their values.

The `env` command can also be used to run another utility in an altered environment by specifying the changes to the environment variables before the utility. For example, running `env VAR1=value1 VAR2=value2 utility` will run the `utility` with the environment variables `VAR1` and `VAR2` set to `value1` and `value2`, respectively.

Additionally, the `env` command can be used with the `-i` option to run a utility in an empty environment. For example, running `env -i utility` will run the `utility` with an empty environment, meaning that no environment variables will be set.