C:\>perl pjf-win32.pl
Successful command returning 1
![] ?[256 : 1] E[]

Nonexistent command, attempted direct but fallback to via cmd
'c:/doesNotExists.exe' is not recognized as an internal or external command, operable program or batch file.
![No such file or directory] ?[256 : 1] E[]

Nonexistent via cmd because 'shell chars'; sending stderr >null
![] ?[256 : 1] E[]