Works fine for me: 
while (<>)
{
    print "got $_";
}

[download]
1   
got 1
2
got 2
0
got 0
5
got 5

[download]
Update: see perlop2:

In these loop constructs, the assigned value (whether assignment is automatic or explicit) is then tested to see if it is defined. The defined test avoids problems where line has a string value that would be treated as false by perl e.g. ``'' or ``0'' with no trailing newline.

In reply to Re: Re: How to trace a dying process by ctilmes
in thread How to trace a dying process by Notromda

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