Here is what the code you posted will actually output:

Global symbol "$line" requires explicit package name at 977513.pl line
+ 11.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 12.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 13.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 14.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 15.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 16.
Global symbol "$line" requires explicit package name at 977513.pl line
+ 17.
Execution of 977513.pl aborted due to compilation errors.
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