格式
while condition
do
statements
done
示例一
#!/bin/bash
i=1
sum=0
while ((i <= 100))
do
((sum += i))
((i++))
done
echo "The sum is: $sum"
示例二
#!/bin/bash
read m
read n
sum=0
while ((m <= n))
do
((sum += m))
((m++))
done
echo "The sum is: $sum"
示例三
#!/bin/bash
sum=0
echo "请输入您要计算的数字,按 Ctrl+D 组合键结束读取"
while read n
do
((sum += n))
done
echo "The sum is: $sum"
示例四
#!/bin/bash
i=5
while [ $i -ge 0 ]; do
printf "
%s" "$i"
# i=`expr $i - 1`
((i--))
sleep 1
done
示例五
#!/bin/bash
while true; do
echo -e " 33[31m请输入MOS平台所使用的域名和端口(格式:mos.zhizhangyi.com:9070): 33[0m"
read -p "" Server_Domain
echo -e " 33[31m请输入RPM包安装方式: 33[0m"
read -p "" Rpm_Way
echo -e " 33[31m请确认您输入的域名和端口是否正确: 33[0m 33[34m${Server_Domain} 33[0m"
echo -e " 33[31m请确认您输入的RPM安装方式是否正确: 33[0m 33[34m${Rpm_Way} 33[0m"
sleep 1
echo -e " 33[31m输入y/n:y确定,n返回(强制退出Ctrl+c): 33[0m"
read -p "" yn
if [ ${yn} = 'y' ];then
break
else
continue
fi
done