如何从等待输入的命令中捕获命令输出？

Question

I have a command that I want to parse. However, this command, in certain scenarios, will prompt if it needs user-intervention (eg yes/no, [enter] to continue, etc.). How to I capture the output from this command while showing all the output? If the command waits for input, it'll look like the command is busy executing when it's really at a prompt.

$ program_output=$(command)
  # Program stalls here performing a `read` but user doesn't see anything
  # User finally presses [Enter]
$

$ command
  Warning: Some warning message.  Continue? (Y/n)
  Y  #User-input
  Created http://example/subprogram/id/
$

Answer 1

If you are capturing stdout, you could print a message on stderr to provide feedback:

echo -n 'Warning: Some warning message.  Continue? (Y/n) ' >&2
read -r answer