"This is a prime example of why I preach so heavily about use strict;. If you had invoked that pragma you'd have seen the warning:

"Use of uninitialized value $_ in print at sopw-simple.pl line 6."

Nuh-uh... strict does no such thing.

strict does three things:

• Throws compile-time errors for undeclared variables.
• Throws compile-time errors when barewords are seen which don't correspond to subs, and don't look like the package name in a class method call.
• Throws run-time errors when symbolic references are used, or more generally when trying to dereference a variable which does not contain a reference.

strict never issues any warnings. And strict doesn't care about variables being undef (unless you try to dereference them).

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