比较Bash中的两个IP地址 [英] Comparing two IP Addresses in Bash

问题描述

我正在尝试查找两个IP地址是否相同.我承认我是bash的新手，但我认为没有任何理由不起作用:

I am trying to find if two ip addresses are the same or not. I admit that I am new with bash, but I see no reason this would not work:

if [[ "$IPAddress" != "$OLDIPAddress" ]]
then
  echo "IP Not the Same"
else
  echo "IP Same"
fi

出于测试目的，我什至对两个变量的值进行了硬编码，但它们仍然不一样.我知道您并不总是能看到自己的错别字，但我不明白为什么这是行不通的.有什么想法吗?

For testing purposes, I have even hard coded the values for the two variables, and they still don't show up as the same. I know you don't always see your own typos, but I do not see why this would not work. Any ideas?

推荐答案

虽然命令应该起作用，但是您可以使用简单的测试运算符(只需放在一个括号中).优点是它可以与任何(POSIX)Shell一起使用.但是，[[运算符也应该起作用.

While your command should work, you can use the simple test operator (just a single bracket). The advantage is that it will work with any (POSIX) shell. However, the [[ operator should work too.

您能重现这个小例子吗? (应输出是"):

Can you reproduce this little example? (Should output 'yes'):

IPAddress="127.0.0.1"
OLDIPAddress="127.0.0.1"

if [ "$IPAddress" != "$OLDIPAddress" ] ; then 
    echo "no"
else
    echo "yes"
fi

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