比较输出而不是命令 [英] Compare output rather than command

问题描述

尝试创建脚本以读取远程文件并检查md5校验和，并在出现不匹配但收到我不理解的错误时发出警报.

Trying to create a script to read a remote file and check the md5 checksum and alert if a mismatch yet getting an error I can't understand.

#!/bin/sh
REMOTEMD5=$(ssh user@host 'md5sum file.txt')
LOCALMD5=$(md5sum 'file.txt')
if [$LOCALMD5 !== $REMOTEMD5]
then
  echo "all OK"
else
  echo -e "no match, Local:"$LOCALMD5"\nRemote:"$REMOTEMD5
fi

这将返回line 4: [6135222a12f06b2dfce6a5c1b736891e: command not found

我曾尝试在$ LOCALMD5周围使用'或'，但似乎从未能够使用它来比较输出.我在做什么错? 谢谢

I've tried using ' or " around the $LOCALMD5 but never seem able to get this to compare the outputs. What am I doing wrong? Thanks

推荐答案

尝试；

if [ "$LOCALMD5" == "$REMOTEMD5" ]

应该会更好.

我认为您的代码中==和！=颠倒了.

I think you got == and != reversed in your code.

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