it is known special case that 
while (<FILEHANDLE>) {
}

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made to read into $_ variable. Either save it's value by "local" operator, or use following special-case construct: 
while ($var_to_receive_a_line = <FILEHANDLE>) {
}

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In reply to Re: When does while set $_ ? by Anonymous Monk
in thread When does while set $_ ? by crenz

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