Question

这是一个简单的学校项目。控制台一直声明[5：命令未找到

#!/bin/bash

num=28
echo "Guess a number a number between 1 and 100"
read guess

while [$guess -ne $num]
do

 if [$guess -lt $num]
 then
     echo "number is higher"
 elif [$guess -gt $num]
 then
     echo "number is lower"
  else
     echo "Correct! The number is $number"
  fi

done

Answer 1

while [$guess -ne $num]

通过首先扩展参数来解释

：

while [5 -ne 28]

然后导致命令[5被执行，并传递参数-ne和28]

您想执行命令[，因此您需要编写：

while [ $guess -ne $num ]

（请注意[和]周围的空格。如果没有空格，则字符会成为另一个字的一部分。）

与if和elif后面的陈述相同。

Answer 2

这样做：

#!/bin/bash
num=28
echo "Guess a number a number between 1 and 100" 
read guess

while [ $guess -ne $num ]; do
  if [ $guess -lt $num ]
  then
    echo "number is higher" 
    read guess
  elif [ $guess -gt $num ]
  then
    echo "number is lower" 
    read guess
  fi
done
echo "Correct! The number is $number"

Bash while循环错误

2 个答案: