shell 在bash [duplicate]中将变量作为输入后无法比较变量

drnojrws 于 2023-06-24 发布在 Shell

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此问题已在此处有答案：

Why should there be spaces around '[' and ']' in Bash?（5个答案）
How can I compare numbers in Bash?（10个答案）
8天前关闭
我有两个变量，我得到作为输入从bash，我想打印两个变量之间的关系，即如果X大于或小于或等于y，这是我试图实现的

read X
read Y

if ["$X" < "$Y"]
    then 
        echo "X is less than Y"
else 
    if ["$X" > "$Y"]
    then 
        echo "X is Greater than y"
    else 
        echo "X is equal to Y"
    fi
fi

我得到的错误

line 4: 2]: No such file or directory
line 8: [5: command not found

shell

来源：https://stackoverflow.com/questions/76479967/cant-compare-variables-after-taking-them-as-input-in-bash

1条答案

按热度按时间

k4emjkb11#

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这看起来是How can I compare numbers in Bash?的复制品。以下是应用于您的示例的一些问题的答案：
试试这个（POSIX）：

#!/bin/sh

read X
read Y

if [ "$X" -lt "$Y" ]
    then
        echo "X is less than Y"
else
    if [ "$X" -gt "$Y" ]
    then
        echo "X is Greater than y"
    else
        echo "X is equal to Y"
    fi
fi

POSIX（POSIX）：

#!/bin/sh

read X
read Y

if [ "$X" \< "$Y" ]
    then
        echo "X is less than Y"
else
    if [ "$X" \> "$Y" ]
    then
        echo "X is Greater than y"
    else
        echo "X is equal to Y"
    fi
fi

Bash（bash）：

#!/bin/bash

read X
read Y

if [[ "$X" < "$Y" ]]
    then
        echo "X is less than Y"
else
    if [[ "$X" > "$Y" ]]
    then
        echo "X is Greater than y"
    else
        echo "X is equal to Y"
    fi
fi

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shell 在bash [duplicate]中将变量作为输入后无法比较变量

1条答案

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