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More on the undefined variables problem. Would adding something like this do a loop be correct.
while ($line0=<>) {$line1=<>;$line2=<>;$line3=<>; last if not defined $line0; last if not defined $line1; last if not defined $line2; last if not defined $line3; do_some_stuff; }

Could I use some OR statements to get these last if-s on a single line. Or can or and and statements used only between two values. I was thinking like

 last if not defined $line0or$line1or$line2or$line3

or

 last if not defined $line0||$line1||$line2||$line3

In reply to Re^3: Reading files n lines a time by naturalsciences
in thread Reading files n lines a time by naturalsciences

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