1). It doesn’t work in all shells, so you have to think about your environment before you use it. 2). I often start with `bar < foo`, so if I need to add more

1). It doesn’t work in all shells, so you have to think about your environment before you use it. 2). I often start with `bar < foo`, so if I need to add more arguments to `bar`, I need to always skip over the input. 3). If I just want to delete all processing and look at the input, I can’t just backspace away the processing because `< foo` is invalid.