比较Shell脚本中的两个数字 [英] Compare two numbers in shell script

问题描述

编写一个Bash shell脚本"order.sh"，该脚本接受两个整数参数"a"和"b"，并打印出适当的关系"a<b"，"a == b"或"a> b"(用"a"和"b"的值替换).

Write a Bash shell script "order.sh" that takes two integer arguments "a" and "b", and prints out the appropriate relationship "a < b", "a == b" or "a > b" (with "a" and "b" replaced by their values).

代码:

#!/bin/bash
echo -n "enter the first number:"; read x
echo -n " enter the second number:"; read y

if ["$x " -lt "$y"]
then
echo "$x < $y"
else
echo"$y < $x"

if [ "$x" -eq "$y"]
then
echo " $x == $y "

fi 

我无法编译他的代码，因为它失败并说"/bin/sh:找不到命令"有人可以告诉我这是什么意思吗?我是Shell脚本的新手，也不知道是什么问题...

i am not being able to compile his code as it is failing and says "/bin/sh: make command not found" can someone tell me what this means? i am new to shell scripting and i have no idea what is the problem...

推荐答案

我无法编译他的代码，因为它失败并说"/bin/sh:找不到命令"，有人可以告诉我这是什么意思吗?我是Shell脚本的新手，也不知道是什么问题...

i am not being able to compile his code as it is failing and says "/bin/sh: make command not found" can someone tell me what this means? i am new to shell scripting and i have no idea what is the problem...

该声明中的几个问题:

• 编译此代码" ...无需编译Bash脚本.Bash是一种解释性语言
• "/bin/sh:找不到make命令"表示的样子完全相同:找不到 make 命令.您在 PATH 上没有 make 命令.但这没关系，因为您不需要在此处 make

• "compile this code" ... a Bash script doesn't need to be compiled. Bash is an interpreted language
• "/bin/sh: make command not found" means exactly what it looks like: the make command is not found. You don't have a make command on your PATH. But it doesn't matter, because you don't need make here

您的脚本有语法错误，例如:

Your script has syntax errors, for example:

if ["$x " -lt "$y"]

您需要在 [之后和] 之前放置一个空格，如下所示:

You need to put a space after [ and before ], like this:

if [ "$x " -lt "$y" ]

其他问题:

• 在3种情况下不使用 if-elif-else
• 破损的条件:有2个 if ，但只有1个结束的 fi

• Not using if-elif-else for the 3 cases
• Broken conditions: there are 2 if but only 1 closing fi

其他一些提示:

• 要使用Bash进行算术运算，请使用((...))而不是 [...] .
• 代替 echo -n;read ，请使用 read -p :这是一个命令，而不是两个命令，并且 echo 的标志不是可移植的，因此最好避免使用它们
• 缩进 if-elif-else 的内容，以使脚本更易于阅读

• For doing arithmetic in Bash, use ((...)) instead of [...].
• Instead of echo -n; read, use read -p: it's one command instead of two, and the flags of echo are not portable, so it's better to avoid using them
• Indent the content of if-elif-else to make the script easier to read

应用了更正和改进后:

#!/usr/bin/env bash

read -p "enter the first number: "
read -p "enter the second number: "

if ((x < y)); then
    echo "$x < $y"
elif ((x > y)); then
    echo "$y < $x"
else
    echo "$x == $y"
fi

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