typora/note/Shell/影响shell程序的内置命令.md

• exit 退出程序
• continue 进行下一次循环
• break 退出循环
• shift 输入参数位移

#! /bin/env bash

sum=0
for i
do
	let sum+=$i
done
echo $sum

#! /bin/env bash

sum=0
while [ $# -ne 0 ]
do
	let sum+=$1
	shift
done
echo $sum

#! /bin/env bash

sum=0
while [ $# -ne 0 ]
do
	let sum+=$1
	shift 2
done
echo $sum