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How to make shell script interact with program

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# 1  
Old 11-04-2009
Question How to make shell script interact with program
Hello all!

I have a C program that runs on a loop, prompting the user for input until it is exited. I want to create a shell script that can run this program and provide input. How can I do this? I have investigated 'expect' and piping to stdin, but haven't had any success. Any help is welcome!

Thank you Smilie
# 2  
Old 11-04-2009
https://www.unix.com/shell-programmin...#post302367979
# 3  
Old 11-05-2009
Quote:
Originally Posted by radish04
I have a C program that runs on a loop, prompting the user for input until it is exited. I want to create a shell script that can run this program and provide input. How can I do this? I have investigated 'expect' and piping to stdin, but haven't had any success. Any help is welcome!

What did you try and what does "haven't had any success" mean? What did happen? What did you want to happen?

The usual method, assuming that the C program reads from the standard input is:

Code:
printf "%s\n" y n filename whatever | name_of_C_program

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