diff --git a/gosh/.api b/gosh/.api
index e6a19a7..fc7b9c5 100644
--- a/gosh/.api
+++ b/gosh/.api
@@ -53,6 +53,7 @@
 pkg gosh, type Cmd struct, Err error
 pkg gosh, type Cmd struct, ExitAfter time.Duration
 pkg gosh, type Cmd struct, ExitErrorIsOk bool
+pkg gosh, type Cmd struct, ExtraFiles []*os.File
 pkg gosh, type Cmd struct, IgnoreClosedPipeError bool
 pkg gosh, type Cmd struct, IgnoreParentExit bool
 pkg gosh, type Cmd struct, OutputDir string
diff --git a/gosh/cmd.go b/gosh/cmd.go
index 0ab4d61..b08b2fd 100644
--- a/gosh/cmd.go
+++ b/gosh/cmd.go
@@ -61,6 +61,9 @@
 	// closed pipe error occurs, Cmd.Err will be nil, and no err is reported to
 	// Shell.HandleError.
 	IgnoreClosedPipeError bool
+	// ExtraFiles is used to populate ExtraFiles in the underlying exec.Cmd
+	// object.  Does not get cloned.
+	ExtraFiles []*os.File
 	// Internal state.
 	sh                *Shell
 	c                 *exec.Cmd
@@ -583,6 +586,7 @@
 	if c.c.Stdout, c.c.Stderr, err = c.makeStdoutStderr(); err != nil {
 		return err
 	}
+	c.c.ExtraFiles = c.ExtraFiles
 	// Start the command.
 	if err = c.c.Start(); err != nil {
 		return err