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Forks a child process to execute the specified command. Takes the
following arguments:

\*rdr
Represents a read filehandle that your program can use to read from
the command $cmd's standard
output. Can be a filehandle object or a reference to a typeglob.

\*wtr
Represents a write filehandle that your program can use to write to
the command $cmd's standard
input. Can be a filehandle object or a reference to a typeglob.

cmd_with_args
The command to be executed by the child process and its arguments.
Can be specified two ways:

$cmd_with_args
$cmd, "arg1", "arg2", ...

8.133. IPC::Msg		8.135. IPC::Open3