/usr/share/doc/perl-Expect/tutorial
Edit: /usr/share/doc/perl-Expect/tutorial/4.A.top (928B)
#!/usr/bin/perl
# This example is a replay of sorts of the rlogin example
#before except in this example we turn control of the process back
#to the user through use of interact().
use Expect;
# $Expect::Debug=2;
$Expect::Exp_Internal=1;
$RSH='/usr/local/bin/ssh';
$host_to_login_to=shift(@ARGV);
# Get the password. We will show how to do this without printing the
# password to the screen later.
print "Enter password: ";
$password=
;
chomp $password;
$rsh=Expect->spawn($RSH,$host_to_login_to);
# Look for a password prompt.
$rsh->expect(30,'-re','word:\s$')||(die"Never got password prompt\n");
print $rsh "$password\r";
# Look for a prompt. Prompt can be # $ > or ] followed by a whitespace.
$prompt = '[\]\$\>\#]\s$';
# Note the use of -re
$rsh->expect(30,'-re',$prompt)||(die "Never got prompt on host\n");
# Start top
print $rsh "exec top\r";
# OK, now return control to user.
$rsh->interact();