Example 7-1. examples/bc/bc1.pl #!/usr/bin/perl
use strict;
use warnings;
use Expect;
my $e = Expect->new;
$e->raw_pty(1);
$e->spawn("bc") or die "Cannot run bc\n";
$e->expect(1, "warranty") or die "no warranty\n";
$e->send("23+7\n");
$e->expect(1, 30) or die "no sum\n";
print "Success\n";
raw_pty turns off echo spawn starts the external program expect(timeout, regex) return undef if failed timeout is in seconds, 0 means check once, undef means wait forever send - as if the user was typing at the keyboard
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