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当你有不匹配的结构时经常会发生这个错误——也就是说，你没有匹配的双引号，匹配的单引号，没有关闭一个控制结构，比如一个缺失的 fi 和 >if，或者缺少带有 for 的 done.

This error occurs often when you have mismatched structure - that is, you do not have matching double quotes, matching single quotes, have not closed a control structure such as a missing fi with an if, or a missing done with a for.

发现这些问题的***方法是使用正确的缩进，这将显示控制结构损坏的位置，以及语法突出显示，这将显示引号不匹配的位置.

The best way to spot these is to use correct indentation, which will show you where you have a broken control structure, and syntax highlighting, which will show you where quotes are not matched.

在这种特殊情况下，我可以看到您缺少一个 fi.在代码的后半部分，您有 5 个 if 和 4 个 fi.但是，您还有许多其他问题 - 您的反引号 touch/tmp/alert.txt... 命令在语法上无效，并且您需要在 if 测试.

In this particular case, I can see you are missing a fi. In the latter part of your code, you have 5 ifs and 4 fis. However you also have a number of other problems - your backquoted touch /tmp/alert.txt... command is syntactically invalid, and you need a space before the closing bracket of an if test.

清理你的代码，错误开始突出.

Clean up your code, and errors start to stand out.