in reply to
checking external program for availability?
Perhaps try File::Which. I'm using it for a program of my own (phenom's scratchpad).
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 (56 votes),