If you have a main function in a rust (.rs) file and you can run it from the command line using the Rust compiler, rustc.

To compile the file, open a terminal and navigate to the directory where the file is located, and then run the following command: rustc filename.rs
(replace filename.rs with the actual name of your Rust file)

This will generate an executable file in the same directory with the same name as your rust file (minus the .rs extension).

To run the program, simply type the name of the executable file in the terminal: ./filename
(replace filename with the actual name of your executable file)