Which build of AS?

Out of curiosity, which of the following work? 

perl -we"system qw[ cmd /c pause ];"
perl -we"system qw[ cmd.exe /c pause ];"
perl -we"system 'cmd /c pause';"

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In reply to Re^3: Windows: system() and PAUSE by ikegami
in thread Windows: system() and PAUSE by rovf

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