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  1. or download this
    % perl -E 'system(q[opera http://www.perlmonks.org/]); say "hello!" ' 
+                               
hello!
  2. or download this
    % perl -E 'system(q[opera http://www.perlmonks.org/ &]); say "hello!" 
+'
hello!
  3. or download this
    % perl -E '$r = fork; if($r == 0) { exec(q[opera http://www.perlmonks.
+org/]) } elsif(defined $r) { say "hello!" }'
hello!