Linux系统shell脚本基础之while循环

• 一、脚本要求
• 二、脚本内容
• • 1、脚本1
  • 2.脚本2
• 三、执行脚本1结果
• 四、执行脚本2

脚本1：计算从1加到100的值，使用while循环
脚本2：输入一个数，输出1加到这个数的值

[root@192 scripts]# cat cal1_100.sh 
#!/bin/bash
########################################
#Author:jeven
#time:Sat 14 May 2022 08:06:28 PM CST
#filename:cal1_100.sh
#Script description:
########################################
i=0
s=0
while [ "$i" != 100 ]
	do
	i=$(($i+1))
	s=$(($s+$i))
	done
	echo "THE result of '1+2+3..+100' is ==> $s"

[root@192 scripts]# cat ./cal_sum.sh 
#!/bin/bash
########################################
#Author:jeven
#time:Sat 14 May 2022 08:06:28 PM CST
#filename:cal1_100.sh
#Script description:
########################################
i=0
s=0
read -p "please enter any num:" NUM
while [ "$i" != $NUM ]
	do
	i=$(($i+1))
	s=$(($s+$i))
	done
	echo "THE result of '1+2+3..+100' is ==> $s"

[root@192 scripts]# ./cal1_100.sh 
THE result of '1+2+3..+100' is ==> 5050

[root@192 scripts]# ./cal_sum.sh 
please enter any num:200
THE result of '1+2+3..+100' is ==> 20100