shell 脚本写法：

* if else 写法

#!/bin/bash

# 定义变量
number=10

# 使用 if-elif-else 判断
if [ $number -eq 10 ]; then
    echo "Number is 10"
elif [ $number -eq 20 ]; then
    echo "Number is 20"
elif [ $number -eq 30 ]; then
    echo "Number is 30"
else
    echo "Number is neither 10, 20 nor 30"
fi

* 集合写法

list=["1" "2" "3"]

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