您不小心运行了名为 test 的系统命令，该命令不产生任何输出.您需要使用 ./test 代替在当前目录中查找脚本，而 test 将使用内置的shell命令(即使没有，它会找到/usr/bin/test 来代替).

You're accidentally running the system command called test, which produces no output. You need to use ./test instead to find the script in the current directory, whereas test will use the built-in shell command (and even if it didn't, it would find /usr/bin/test instead).

这就是为什么您应该避免调用测试程序 test 的原因.试试 try .

This is why you should avoid calling your test programs test. Try try instead.