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open ONE, "somefilethatdoesnexist" or print "one: $!\n";
open TWO, "somefilethatdoesnexist" || print "two: $!\n";
print "one: $!\n" unless open ONE, 'somefilethatdoesnexist';
open TWO, 'somefilethatdoesnexist';
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 (166 votes),