• shell脚本系列:while语句


    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
    
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  • 原文地址:https://www.cnblogs.com/iuskye/p/shell-while.html
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