会显示错误输出组件(图49)。
禁止错误输出符号是非常慢的。
清单1显示的是这个即时检验产生的错误输出的示例。
Listing 1 shows an example of the error output generated from this on-the-fly validation.
stderr是标准错误流，显示命令中的错误输出。
stderr is the standard error stream, which displays error output from commands.
由于第一个字符是多字节的，因此会导致字符分解和错误输出。
Since the first character is multi-byte, it results in splitting the character and leads to dirty output.
如果构建失败，将发送一封email，其中包含构建生成的错误输出。
If the build fails, an email is sent containing the error output produced by the build.
无法处理的每个类型在紧跟包含此警告的行后面的错误输出中列出。
Each type that cannot be handled is listed in the error output immediately following the line containing this warning.
通过使用子外壳，可以对整个块（而不是单个命令）的标准和错误输出进行集体重定向。
Using the subshell, you can collectively redirect their standard and error output for the entire block instead of for each individual command.
例如，您可以建立事件处理常式，将所有错误输出行存入指定的错误记录档。
For example, you might create an event handler that stores all error output lines into a designated error log file.
在遇到错误时，它甚至能够向指定的电子邮件地址发送错误输出，从而帮助对问题进行调试。
It even sends any error output to a specified E-mail address so you can debug problems when they occur.
这是事实。虽然你总是可以重定向标准输出和标准错误输出，没有什么比命令行错误消息好。
That's true. Although you can always redirect stderr and stdout, nothing beats a good command line error message.
如果一个程序提供详细的错误输出而且表现正常，那么不使用任何特权来运行这个程序，然后检查错误消息，看看它缺少哪些特权。
If a program were verbose and well behaved, it might be possible to simply run the program without privilege and have it complain about which privileges it lacks.
在处理生成有用的错误输出的命令时，您经常会看到这个操作符，比如用于编译UNIX程序的make工具：make2> build-errors。
You'll see this most often when dealing with commands that have useful error output, such as the make tool used to build UNIX programs: make 2> build-errors.
总结了英文光学字符识别（OCR）系统中的常见错误类型，论证了使用拼写检查技术发现错误的可能性。 以最相似单词替换OCR的错误输出，从而达到改正错误的目的。
Putting up the type of the common errors from the system English OCR, it has proved it feasible to use a spelling check technology to find its errors.
如果没有发生错误，那么这个参数在输出上是NULL。
If no errors occurred, then this parameter is NULL on output.
它还可以实时评估你的语言约束，并输出错误消息。
It also evaluates your language constraints in real time and outputs error messages.
一个操作中包含输入、输出和错误。
远程执行还模拟客户端主机的标准输入、输出和错误。
Remote execution also emulates the standard input, output, and error of the client host.
当数据库连接失败时，会输出连接错误消息。
If the database connection fails, the connection error message may be output.
请启动节点代理服务器，并验证系统输出和错误日志中是否包含任何异常。
Start the node agent server and verify that the system output and error logs do not contain any unexpected exceptions.
如果希望将错误或标准输出组合为单个文件，请使用编号重定向(请参见清单4)。
If you want to combine error and standard output into a single file, use numbered redirection (see Listing 4).
在本文中，我们已经了解了跟踪错误、保存输出以及记录问题以便进行处理和报告的各种方法。
Throughout this article, you've looked at ways of trapping errors, saving the output, and recording issues so that they can be dealt with and reported.
回头再来看一下清单7，并注意在对错误进行处理时，只将少数常见的错误消息输出给用户了。
Look back at Listing 7 and notice that while errors are handled, it's only a very generic error message that is output to the user.
还需要能够跟着错误和程序输出，并需要能够确保脚本的执行环境的安全性和有效性。
You also need to be able to trap errors and output from programs and ensure the security and validity of the environment in which the script executes.
使用qr码输出需要较少的错误检查。
只要输出中没有错误，这些参数可以忽略。
As long as there are no errors in the output, it can be ignored.
标准C库（因而，每个UNIX程序）定义了三种标准流：输入、输出和错误。
The standard C library (and thus, every UNIX program) defined three standard streams: input, output, and error.
您可以将php中的相同通道分别用于输入、标准输出和输出到错误通道。
You can use the same channels in PHP for input, standard output, and output to the error channel, respectively.
获取任务的输入消息、输出消息和缺省消息，然后设置输出或错误消息。
Get the input message, output message, and fault messages of a task, and to set the output or fault messages.
由于要处理的代码模块有成百上千个，因此最佳起点是显示找到错误的输出位置，然后从该位置开始逆向查找来隔离问题。
With hundreds of code modules to deal with, a good place to begin is where the output revealing the bug is found, then work your way backward from there to isolate the problem.
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