15.7.1. Problem You want to sound an alarm on the user's terminal.

15.7.2. Solution
Print the "\a" character to sound a bell: 

print "\aWake up!\n";
Or use the "vb" terminal capability to show a visual bell:

use Term::Cap;

$OSPEED = 9600;
eval {
    require POSIX;
    my $termios = POSIX::Termios->new( );
    $termios->getattr;
    $OSPEED = $termios->getospeed;
};

$terminal = Term::Cap->Tgetent({OSPEED=>$OSPEED});
$vb = "";
eval {
    $terminal->Trequire("vb");
    $vb = $terminal->Tputs('vb', 1);
};

print $vb;                                  # ring visual bell
15.7.3. Discussion
The "\a" escape is the same as "\cG", "\007", and "\x07". They all cor
+respond to the ASCII BEL character and cause an irritating ding. In a
+ crowded terminal room at the end of the semester, this beeping cause
+d by dozens of vi novices all trying to get out of insert mode at onc
+e can be maddening. The visual bell is a workaround to avoid irritati
+on. Based upon the polite principle that terminals should be seen and
+ not heard (at least, not in crowded rooms), some terminals let you b
+riefly reverse the foreground and background colors to give a flash o
+f light instead of an audible ring.

Not every terminal supports the visual bell, which is why we eval the 
+code that finds it. If the terminal doesn't support it, Trequire will
+ die without having changed the value of $vb from "". If the terminal
+ does support it, the value of $vb will be set to the character seque
+nce to flash the bell.

There's a better approach to the bell issue in graphical terminal syst
+ems like xterm. Many of these let you enable the visual bell from the
+ enclosing application itself, allowing all programs that blindly out
+put a chr(7) to become less noisy.
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.