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perl -e "my $shoo = 50; $shoo ||= 100; print $shoo;"
perl -e "$shoo=50; $shoo = ($shoo)?50 : 100;print $shoo;"
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 (117 votes),