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Putting a filename as a parameter to a perl script then reading from it in the code?
The variable @ARGV contains the command line options. perlintro has examples for opening files and reading them line by line.
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.
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