so i can open with filehandle "infile" without "$"?
You CAN but there are good some very good reasons not to.
You will notice from the last link above the "Modern Perl", Recommended by Anonymous Monk below, does not use it.
At the end of the day its a choice that you make but I disagree with igelkott on this.
To differentiate you could always call it $input_file_handle or similar.
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