http://www.perlmonks.org?node_id=801

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

Due to the current implementation on some operating systems, when you use the glob() function or its angle-bracket alias in a scalar context, you may cause a leak and/or unpredictable behavior. It's best therefore to use glob() only in list context.