Re: Responding to terminal I/O

[CountOrlok]

This isn't the right way to approach this. When you do system("su"), your program will sit and wait for the su command to finish or timeout before going on the next line of code.

The larger question would be why do you want to do "su"? Are you then going to run certain commands as root? You should instead look into using something like the Expect module.

[cspctec]

I am trying to write a script that will simulate a superuser log in attempt failure, but I'm not sure how to send a password to the terminal when the terminal requests a password.

[CountOrlok]

this should get you started:

use strict;
use warnings;

use Expect;

my $timeout = 5;
my $password = "password";
my $shell_prompt = ']$ ';

my $exp = new Expect;
$exp->raw_pty(1); 
$exp= Expect->spawn("su")
    or die "Error calling su:  $!\n";
unless ($exp->expect(5,"Password: ")) { 
  die; # add error handling
};
$exp->send("$password\n");
unless ($exp->expect(5, $shell_prompt)) { 
  die; # add error handling
};
print "Login successful\n";