note grep <c>++</c> is the [http://perldoc.perl.org/perlop.html#Auto-increment-and-Auto-decrement|auto-increment operator]. <br /> <c>$hash{$line}</c> is a hash assignment <p> So <c>$hash{$line}++</c> auto-increments the value of <c>$hash{$line}</c> <p> Also please read [id://17558] and use <c><code></c> tags around your code <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-133383"> [id://133383|grep]<br \> <tt>One dead unjugged rabbit fish later...</tt> </div></div> 655898 655898