【Linux】shell 脚本条件判断、函数、循环

shell 脚本条件判断

我们可以用 && 和 || 进行简单的条件判断，但是复杂场合并不适用，因此 shell 脚本提供了条件判断语句。

if 条件判断；then
//判断成立要做的事情
fi

if [ "$value" == "y" ] || [ "$value" == "Y" ]; then
	echo "your input is y "
	exit 0
fi 
if [ "$value" == "n" ] || [ "$value" == "N" ]; then  
	echo "your input is n "
	exit 0
fi

if 条件判断；then
//判断成立要做的事情
else
//判断不成立要做的事情
fi

if [ "$value" == "y" ] || [ "$value" == "Y" ]; then
	echo "your input is y "
	exit 0
else   
	echo "your input is $value "
	exit