cmdtype

type Cmd []string

type CmdRunOptions struct {
	RedirectStdin  io.Reader // default os.Stdin
	RedirectStdout io.Writer // default os.Stdout
	RedirectStderr io.Writer // default os.Stderr
	AppendedArgs   []string  // useful for package install append package spec, []string{} or nil for none
	WorkingDir     string    // change working directory, "" for use default, will do subs for it
	DryRun         io.Writer // won't run, only prints command to run to writer, nil for normal run
	DryPrintPrestr string    // prestr for dry run print, appended before every line
}