activeperl - Perl not recognised as a command -

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i have installed activeperl 5.20.2 build 2002. however, when open command prompt window , type command perl -v, obtain message: 'perl' n'est pas n'est pas reconnu en tant que commande interne ou externe,...i.e 'perl' not not recognized internal or external command. in list of programs installed, activeperl appears. confused. can me please??


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