Use 'expect' in Bash Script to Automate Entering Inputs

expect <<HEREDOC
  spawn some long command;

  expect {
    "some text 1" {
      set timeout -1;
      send "some input\r";
      exp_continue;
    }
    "some text 2" {
      set timeout -1;
      send "some input\r";
      exp_continue;
    }
    "some text 3" {
      set timeout -1;
      send "some input\r";
      exp_continue;
    }
  }
HEREDOC