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  1. or download this
    open F, "| some_shell_expression"; # open for writing
open F, "some_shell_expression |"; # open for reading
  2. or download this
    /usr/bin/mycommand < file
  3. or download this
        my $cmd = "/usr/bin/mycommand < file";
    if ( system $cmd ) {
...
                  : 'without'
              : sprintf "child exited with value %d\n", $? >> 8;
    }