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  1. or download this
    ~$ perl -E 'my @x=({uno=>'one'},{dos=>'two'},{tres=>'three'}); map {sa
+y}  keys %$_ for @x'
  2. or download this
    ~$ perl -E 'my @x=({uno=>'one'},{dos=>'two'},{tres=>'three'}); say  ke
+ys %$_ for @x'
  3. or download this
    ~$ perl -E 'my @x=({uno=>'one'},{dos=>'two'},{tres=>'three'}); say for
+  keys %$_ for @x'
syntax error at -e line 1, near "$_ for "