I have a program that waits for the user to enter a string input, how can I enter that string input while debugging my program with IDA?

2 Answers 2


You can use I/O redirection operators in the Process options-Parameters field:

The standard input/output/error channels can be redirected using the bash shell notations. for example: >output 2>&1

  • Brilliant !!!! I love IDA :D
    – maysara
    Jul 4, 2019 at 20:00

I have found the answer after hours of searching, it is really sad that such a great tool doesn't have this option easily enabled. anyway, you have to lunch the IDA from the terminal but you have to add

"cat |"

before it. For me, it was like this

cat | ./ida64 

and then when the program waits for the user's input, you have to go back to the terminal and supply it there.

If you want to add a file as an input you can do this

cat myfile | ./ida64 

If you know any better solution please post it here.

  • You may as well use yes then. If this above method worked you may also want to check out expect and its variants (such as pexpect).
    – 0xC0000022L
    Jul 3, 2019 at 21:52

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