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  run( -out => \*MYOUT,
       -out2 => \*MYOUT,
       @command );

Any filehandle can be opened in any mode; C<-in> merely defaults to
meaning C<-in0>, and C<-out> defaults to meaning C<-out1>.  There is
no C<-err>; use C<-out2>.  C<-rw> exists (defaulting to C<-rw0>), but
is probably of limited use.

Here is an example of using C<prompt_passwd()> to hijack C<gpg>'s
password grabbing;

  my $password = prompt_passwd("Encryption password: ");
  my $encrypted = run( -in4 => sub { print "$password\n" },
                       "gpg", "--passphrase-fd", "4", "-c", $file )

=item B<run_err("command", "arg2", "arg1")>

Same as run, but returns the error code rather than assuming that the
command will successfully complete.  Again, output it suppressed.

=item B<capture("command", "1gra", "2gra")>

runs a command, capturing its output, barfs if there is a problem.
Returns the output of the command as a list or a scalar.