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unlink "rename2.txt" or die "Can't delete file: $!";
copy ("rename1.txt", "rename2.txt") or die "Can't copy file: $!";
unlink "rename1.txt" or die "Can't delete file: $!";
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 (144 votes),