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  1. or download this
    $ perl -MScalar::Util=reftype -le'open my $fh, "<", \$buf; print refty
+pe($fh)'
GLOB
  2. or download this
    $ perl -le'open my $fh, "<", \$buf; print $fh; printf "0x%x\n", 0+$fh'
GLOB(0x814ec28)
0x814ec28