- Position the Cursor:
  \033[<L>;<C>H
     Or
  \033[<L>;<C>f
  puts the cursor at line L and column C.
- Move the cursor up N lines:
  \033[<N>A
- Move the cursor down N lines:
  \033[<N>B
- Move the cursor forward N columns:
  \033[<N>C
- Move the cursor backward N columns:
  \033[<N>D

- Clear the screen, move to (0,0):
  \033[2J
- Erase to end of line:
  \033[K

- Save cursor position:
  \033[s
- Restore cursor position:
  \033[u

#!/bin/bash

echo -n '------------------------------------------'
echo -n -e "\r"                                              # 移动光标到行首

while true;
do
    echo -n -e '\033[1C'                                     # 光标向后移动一位
    echo -n -e '\b'                                          # 删簇一个字符 
    echo -n '#'                                              # 打印一个井号
    sleep 0.5                                                # 休眠 500ms
done