Execute and pass parameter to external program

Question

hi all,
i need to wrap a program using java.
i would like to write a java program able to ask for user input as soon as wrapped command ask for.
from the user point of view the behaviour should be the same.
example
program to be wrapped: mycommand.exe
mycommand synopsis
mycommand file1: mycommand ask for a string and writing it in file file1
i would like to execute mycommand file1
in a java program getting the orginal behaviour.
so...
String command = "mycommand file1";
Process process = Runtime.getRuntime().exec(command);
// from now on somebody can help me?
thank you
Luca

Answer 1

lrasco wrote:
i would like to write a brute force password cracker (for my own use, i forgot a password).
rar ask user for password, if ok exit 0 otherwise exit 1 (i suppose).
my program execute rar, which sholud ask for password, pass a password, check for exit code, then exit or continue.That tells us what you're trying to accomplish, not what problems you're having.
For the record, I'm extremely skeptical of your claim that this is for the legitimate use of recovering your own password. The proper approach would be to contact the admin to reset it.
Of course, trying to brute force crack a password by executing an interactive program like this will be extremely slow anyway. Assume a 6 letter password over the 62-character space of uppercase, lowercase, and digits. There are 62^6 = 56,800,235,584 possible passwords. On average, you'll have to search through half of them, which is 28,400,117,792. If you can do 100 / sec., then that will take 28400117792 / 100 / (60 x 60 x 24 x 365) = 9 years.
EDIT: Stupid math operator markup.
Edited by: jverd on Jan 13, 2010 11:20 AM
EDIT: fixed math error
Edited by: jverd on Jan 13, 2010 11:21 AM