Automatically entering inputs into executable code at prompt

I have an old executable code, say run.exe, which asks for user inputs. I would like to create a script which automatically runs the executable and enters the user inputs. I have figured out how to run the code, but I am not sure how to enter the inputs at the prompt in an automated fashion.

execute = '!run.exe'
eval(execute) % This runs the executable

% Executable returns:
Enter input value a:

I do not have access to the coding for the executable, and I have not seen it, so I do not know how to recreate it. Is it possible to have automatic entries for this type of situation?

Answer 1

[Bob Thompson]

Ok, I figured out how to do this. Basically instead of entering the inputs as individual commands the inputs are entered into a text file.

commandfile = fopen('commandfile.txt','w');
fprintf(commandfile,'Enter inputs to read in executable here');
fclose(commandfile);
system('executable.exe < commandfile.txt'); % I used the system command here, rather than evaling '!'. I believe they both would work, but I decided to stick with system from another user.

By using the actually command prompt command of 'executable.exe < commandfile.txt' command prompt knows to run the executable and read the command input text at the same time, allowing for commands to be entered into the executable.

[Chien-Han Su]

This works for me (on MATLAB 2020a under Ubuntu 20.04 LTS)! Thank you!