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$ perl -d:Foo -e1
Can't locate Devel/Foo.pm in @INC (...)
$ perl -d:Foo=opt -e1
Can't find string terminator ";" anywhere before EOF.
$ echo 1 | perl -d:Foo=v
# Failed at ./t/run/new_switchd.t line 44
# got ''
# expected /(?i-xsm:^main,swdtest.tmp,9;Foo,swdtest...
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 (241 votes),