Actually, re Test1, 2, that was a typo as you suspected, but neither of those progs exist (deliberately), as indeed neither does the t.t file.
I am trying to get Perl to give me the same err msg that the shell does, which it does for Test3, but not Test1 or 2.
Bonus Qn3: Why are the msgs for 1 & 2 different?

Cheers
Chris