Shell script to run program that asks for input

Question

I have a C program in which two scanf() are done.

I need to write a shellscript that will run the program and give it the arguments too.

The problem is that all I could come up with is how to pipeline an argument into the program as a command line arguments which is not what I need.

Any help appreciated.

Can you post what you have tried.. You have mentioned that you have tried some thing related to pipe lining. — Ajai
– Ajai, Commented Mar 5, 2012 at 2:25

John3136 · Accepted Answer · 2012-03-05 02:25:06Z

1

This should work

echo "some input" | yourprog

e.g. echo "1 1 + p" | dc

answered Mar 5, 2012 at 2:25

John3136

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3 Comments

Ajai Over a year ago

In what way is this not using pipeline? The code that you posted and the answer mentioned above have no difference. You are doing it in perl and the above answer is doing it in shell script. You have also mentioned in your question that you don't require a pipeline answer... Wonder why this simple reply should be the answer though

Pi_ Over a year ago

@Ajai You are right but for some reason the perl script did not produce the desired behavior (i.e. output). I myself do not know why. I am using the shellscript to run format string attacks on a virtual machine running old versions of everything, this might be the cause.

John3136 Over a year ago

perl -e 'print <>' ? - note that it will buffer until EOF in stdin.

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