* 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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