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open FILEHANDLE,'filename' or die "open of 'filename' failed: $!\n";
open my $handle,'<','filename' or die "open of 'filename' failed: $!\n
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
Results (244 votes),