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           system "echo $arg";         # Insecure
           system "/bin/echo", $arg;   # Secure (doesn't use sh)
...

           $path = $ENV{'PATH'};       # $path now NOT tainted
           system "echo $data";        # Is secure now!

system "/usr/sbin/useradd $cli";

## taint environmentals
$ENV{'PATH'} = "/bin:/usr/sbin";
...
  print "CLI is $cli";

  system("/usr/sbin/useradd $cli");

-s "/bin/false" -d "/home/clients/stage.domain.com/testcjm" -G "hostin
+g,domain" testcjm