Perl Syntax

[John Vetterli]

On Mon, 23 May 2005, Kevin C. Krinke wrote:
> %SIG which $SIG{INT} is a part of is one of the "magical" things in
> Perl. The %SIG hash represents all the different application signals
> (ie: kill, term, quit, hup, etc) and what to do when the individual
> signals are received.
> $SIG{INT} is the INTerrupt signal which is normally associated with
> something bad happening that cases the program to exit prematurely.
> ...
> Now whenever the program receives the application signal "INT", the
> function do_signal will be called because the code reference to the
> function do_signal is referenced as the value of the INT key of the
> magical %SIG hash.

So is the "INT" in $SIG{INT} a string literal (i.e. is it really 
$SIG{"INT"}) or a variable name?  Or is it something else?

JV
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