beam/examples/beamsh: 'chdir' changes the current directory

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

pkg/beam/examples/beamsh/beamsh.go

@@ -323,6 +323,8 @@ func GetHandler(name string) Handler {
 		return CmdOpenfile
 	} else if name == "spawn" {
 		return CmdSpawn
+	} else if name == "chdir" {
+		return CmdChdir
 	}
 	return nil
 }

pkg/beam/examples/beamsh/builtins.go

@@ -436,3 +436,7 @@ func CmdOpenfile(args []string, stdout, stderr io.Writer, in beam.Receiver, out
 		}
 	}
 }
+
+func CmdChdir(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
+	os.Chdir(args[1])
+}