Perl operators question

Here's a real beginners question:

What do the assignment operators "||=" and "&&="do?  I understand "+=" and
"-=" and the like;, but I can't figure out what these two do.

Perldoc perlop isn't much help, saying only that they "work as in C", and my
copy of "The C Programming Language" -- don't ask why I have it, since I've
never programmed in C -- doesn't shed any light on it.

Thanks.

 - geoff 

• Perl operators question by Geoffrey F. Green
• RE: Perl operators question by Bob Showalter
• RE: Perl operators question by wiggins
• Re: Perl operators question by Jenda Krynicky