【Shell脚本基础系列-8】用户交互

Shell脚本入门与实践：用户交互和猜数字游戏

原创已于 2022-08-06 05:05:58 修改 · 293 阅读

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#bash #linux #运维

于 2022-08-06 04:54:22 首次发布

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这篇博客介绍了Shell脚本的基础知识，包括用户交互、条件判断和循环控制。通过实例展示了如何从用户获取输入，进行参数验证，并实现了一个猜数字游戏，游戏中用户需猜测计算机生成的随机数。文章还提供了LinkedInLearning的进一步学习资源。

Interactive

Use read command to to get input from the user.

简单的示例

#!/usr/bin/env bash

read -p "What is your first name: " NAME
# -p: put the prompt on the same line as the user input

echo "Your name is: $NAME"

exit 0

校验用户输入

#!/usr/bin/env bash

VALID=0

while [ $VALID -eq 0 ]
do
    read -p "Please enter your name and age: " NAME AGE
    if [[ ( -z $NAME ) || ( -z $AGE ) ]] 
    then
        echo "Not enough parameters passed"
        continue
    elif [[ ! $NAME =~ ^[A-Za-z]+$ ]] 
    then
        echo "Non alpha characters detected [$NAME]"
        continue
    elif [[ ! $AGE =~ ^[0-9]+$ ]] 
    then
        echo "Non digit characters detected [$AGE]"
        continue
    fi
    VALID=1
done

echo "Name = $NAME, Age = $Age"

exit 0

猜数字游戏

#!/usr/bin/env bash

COMPUTER=$(($RANDOM%100))
WIN=0

while [ $WIN -eq 0 ]
do
    # read in the number
    read -p "Please enter your number (0-100): " NUMBER

    # validation
    if [ -z $NUMBER ] 
    then
        echo "Please enter one parameter"
        continue
    elif [[ ! $NUMBER =~ ^[0-9]+$ ]] 
    then
        echo "Non digit characters detected [$NUMBER]"
        continue
    elif [ $NUMBER -gt $COMPUTER ] 
    then
        echo "Enter a smaller number"
        continue
    elif [ $NUMBER -lt $COMPUTER ] 
    then
        echo "Enter a bigger number"
        continue
    fi
    WIN=1
done

echo "That's it! The number is $COMPUTER ."

exit 0