system( nmap $target);

Not exactly sure if that's what you're asking, but system() expects either a single string as the command to run 

system("nmap $target");

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or a list of values 

system("nmap", $target);

[download]

In reply to Re: Add Perl Varibles in system() by almut
in thread Add Perl Varibles in system() by ahjohnston25

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