「ANSI Escape Code」- 终端转义序列

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认识

文档：Standard：ECMA-48，ISO/IEC 6429，FIPS 86，ANSI X3.64，JIS X 0211

ANSI escape sequences are a standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. 简而言之，ANSI Escape Code 是个字符序列，其用于控制终端来操纵终端文字的显示行为。

ANSI American National Standards Institute

History https://en.wikipedia.org/wiki/ANSI_escape_code#History

组成

Certain sequences of bytes, most starting with an ASCII escape character and a bracket character, are embedded into text.

性质

提供终端字体颜色修改 Color

https://en.wikipedia.org/wiki/ANSI_escape_code#Colors

提供光标位置控制功能 Cursor Location

移动光标的转义序列 | Cursor Movement | https://tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html 

- 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

构建

The entire table of ANSI color codes.https://github.com/termstandard/colors

ANSI Color Code | https://github.com/termstandard/colors

\e[31m \033[31m
\e[0m \033[0m

应用

场景 | 实现进度条

#!/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

场景 | 删除颜色代码

./somescript | sed 's/\x1B\[[0-9;]\{1,\}[A-Za-z]//g'

参考

Wikipedia/ANSI escape code
Bash tips: Colors and formatting (ANSI/VT100 Control sequences)