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  1. or download this
    $fh = select;
print("currently selected FILEHANDLE:$fh\n");
  2. or download this
    #2: warning at C:\warntest.pl line 16.
#4: warning at C:\warntest.pl line 28.
...
currently selected FILEHANDLE: main::STDOUT
#4: warning at C:\warntest.pl line 37.
currently selected FILEHANDLE: main::STDOUT