A new environment variable can be exported and assigned a value with a single command.

True. In Unix-like shell environments, you can export and assign a value to a new environment variable in a single command. The syntax for doing this varies slightly between different shell languages (such as Bash, sh, etc.), but the general concept remains the same.

For example, in Bash, you can export and assign a value to a new environment variable using a single command:

export MY_VARIABLE="some_value"

This command both creates the environment variable MY_VARIABLE and assigns the value "some_value" to it, making it available to other processes launched from the current shell session.