Question

我正在学习在Shell中制作小程序，我正在研究如何定义使用系统计算器（bc -l）的函数。我将展示我想要做的事情：

#!/bin/bash
square (){
I need help here!
}
cube (){
I need help here!
}
rectangle (){
I need help here!
}
exit (){
help
}
I need help here!
echo "Little program that computes the following:"
echo "a) Surface of a square"
echo "b) Volume of a cube"
echo "c) Surface of a rectangle"
echo "e) exit"
echo "Choose the option you want to compute"
read answer
if [ $respuesta == "a" ]
then echo "What's the side of the square"
read l`

在那之后，我现在不知道如何调用我的功能＆＃34;吃＆＃34;用户的回答，然后显示计算。事情变得更糟，因为在计算之后我必须询问用户他是否想要继续或退出。如果有人能帮助我，我将非常感激。抱歉我的英语。我不是母语人士。

Answer 1

这是你在找什么？：

menu="some items to choose from:
                A) something
                B) something else"
sample () {
    a="$1"
    b="$2"
    c="$3"
    printf "c: %s" "$c"
    echo "$a+$b" | bc
    echo "$a*$b"  | bc
    echo "$a/$b"  | bc
}

add=$(echo "2+2" | bc)
printf "Added: %s\n" "$add"

echo "$menu"
read -p "choose: " choice

case "$choice" in
    A) sample "30" "5";;
    B) sample "2" "2" "2";;
    *) echo "not a choice";;
esac

Answer 2

以下是使用select语句在BASH中支持的代码。对于方形，立方体，矩形的功能，你可以很好地完成它。

#!/usr/bin/env bash

square (){
echo "I need help here! - square"
}
cube (){
echo "I need help here! - cube"
}
rectangle (){
echo "I need help here! - rectangle"
}
exit (){
echo "help"
}

options=("Surface of a square" "Volume of a cube" "Surface of a rectangle" "exit")

select opt in "${options[@]}"
do
    case $opt in
        "${options[0]}")
            echo "you chose choice 1"
            square
            ;;
        "${options[1]}")
            echo "you chose choice 2"
            cube
            ;;
        "${options[2]}")
            echo "you chose choice 3"
            rectangle
            ;;
        "${options[3]}")
            break
            ;;
        *) echo invalid option;;
    esac
done

Unix Shell脚本函数

2 个答案: