# 自己寫吧！Hello,Bash：echo

寫任何程式語言的第一個入門，都是 say hello

進入Bash shell命令行，輸入 

```
echo "Hello, World"
```

<div align="left"><img src="/files/-LujIunJ3QcFJ4zlErzU" alt=""></div>

把上述命令寫成可執行檔，並以.sh為結尾，如hello.sh

```
#!/bin/bash
#第一個shell程式
echo "Hello, World"
```

chmod +x hello.sh

執行 ./hello.sh

在Windows上編輯script，這將產生Bash無法處理的不正確的行尾字符，一個常見的症狀是: command not found，此時需要安裝dos2unix，可以使用dos2unix程序修復script

## echo顯示帶顏色，需要使用參數-e&#x20;

格式: echo -e "\033\[字背景顏色;文字顏色m 字串 \033\[0m"

### **每種顏色都有對應的顏色碼。比如:重置=0,黑色=30,紅色=31,綠色=32,黃色=33,藍 色=34,洋紅-35,青色-36,白色-37。字顏色:30<=>37**

```
echo -e "\033[31m 紅色字\033[0m"
echo -e "\033[33m 黃色字\033[0m"
echo -e "\033[41;33m 紅底黃字\033[0m"
```

### 字背景顏色範圍:40<=>47

```
echo -e "\033[40;37m 黑底白字\033[0m"
echo -e "\033[41;37m 紅底白字\033[0m"
echo -e "\033[42;37m 綠底白字\033[0m"
echo -e "\033[43;37m 黃底白字\033[0m"
echo -e "\033[44;37m 藍底白字\033[0m"
echo -e "\033[45;37m 紫底白字\033[0m"
echo -e "\033[46;37m 天藍底白字\033[0m"
echo -e "\033[47;30m 白底黑字\033[0m"
```

> **最後面控制選項說明**
>
> \33\[0m 關閉所有屬性 \
> \33\[1m 設置高亮度 \
> \33\[4m 下劃線 \
> \33\[5m 閃爍 \
> \33\[7m 反顯 \
> \33\[8m 消隱 \
> \33\[30m -- \33\[37m 設置前景色 \
> \33\[40m -- \33\[47m 設置背景色 \
> \33\[nA 光標上移n行 \
> \33\[nB 光標下移n行 \
> \33\[nC 光標右移n行 \
> \33\[nD 光標左移n行 \
> \33\[y;xH設置光標位置 \
> \33\[2J 清屏 \
> \33\[K 清除從光標到行尾的內容 \
> \33\[s 保存光標位置 \
> \33\[u 恢復光標位置 \
> \33\[?25l 隱藏光標 \
> \33\[?25h 顯示光標&#x20;

```
echo -e "\033[41;33m 紅底黃字\033[5m hahah \033[0m"
```


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