I am unsure about what you are trying to achieve here as there is very little of the code.
$_ is a global variable and quite a few places in perl use $_ as the default.
To know more use 'perldoc perlvar' and you will have a good explanation of where and how $_ can be used.
Below is a small program that uses $_ as the default for both the while loop and the print statement.
I hope this helps.
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