如果文件不存在，则认为它有零行。
If the file doesn't exist, it's treated as having zero lines.
如果文件不存在，那么脚本将退出，并且不应执行任何处理。
If the file is not present, then the script exits, as no more processing should be carried out.
当然，如果文件不存在或者不可读，您可以期望一个负返回值。
Of course, if the file is nonexistent or nonreadable, you can expect a negative return value.
Apache mod_rewrite：如果文件不存在，就通过委托生成路径。
如果这两个文件都不存在，那么只允许超级用户使用这个命令。
If neither of these files exists, only the super user will be allowed to use this command.
如果此文件不存在，安装程序会创建它。
If the file does not exist, the installation application creates it.
创建一个新项目(或使用已有项目)来保存ovf信封文件(如果不存在的话)。
Create a new project (or use an existing project) to hold the OVF envelope files if one does not already exist.
如果这个配置文件不存在，第二个搜索就查找C0A8000，依次类推。
If this configuration file is not present, the next searched for is C0A8000, and so on.
如果XML输入参数文件不存在，则脚本将提示从控制台进行输入。
If the XML input parameter file is not present, the script will prompt for input from the console.
如果该文件尚不存在，则自动创建它。
The file is created automatically if it doesn't already exist.
如果脚本在UID或GID文件中找到的用户或组在系统中不存在，那就跳过该行。
If the script finds a line in the UID or GID file for a user or group that does not exist on the system, the line is simply skipped.
MAK文件指定可交付使用的产品、它们的从属性和构建这些可交付使用产品的命令（如果它们不存在或者比它们所从属的产品还要老的话）。
The MAK file specifies the deliverables, their dependencies, and the command to build the deliverables if they don't exist (or if they are older than the dependencies).
一个名为.hsqldb的项目如果不存在就会被创建，而在该项目中引擎将查找database . script和其他数据库文件。
A project named.hsqldb is created, if it does not exist, and inside it the engine will look for database.script and other database files.
如果类装载器试图寻找一个不存在的资源，那么在应用程序或者applet中的所有JAR文件都会下载。
If the class loader tries to find a nonexistent resource, all the JAR files within the application or applet will have to be downloaded.
out put -dir[目录]——报告文件存放的位置；如果目录不存在，则自动创建该目录。
Output-dir [directory] — a place to put the report files; the directory will be automatically created if it doesn't already exist.
取决于供应商所在的地区，StockCheck作业的输出被传递到5个不同的目标，或者，如果供应商所在地区不存在危险零件，则生成一个否认文件。
The output of the StockCheck job is directed to one of five different targets depending upon the region of the supplier, or a reject file if the region of the supplier is not classified.
将msvcp71.dll和msvcr71.dll复制到Windows\System32（如果这两个文件不存在），以便将其安装在 Windows系统路径。
If they aren't already there, copy msvcp71.dll and msvcr71.dll to Windows\System32, so that they are installed on the Windows system path.
如果这个文件不存在，那么模块就不会显示在模块列表中。
If this file does not exist, your module will not show up in the module listings.
如果您无法列出该文件，则表示该文件不存在。
常量ziparchive：CREATE表示如果具有该名称的文件尚不存在，则应当创建一个新文件。
The constant ZIPARCHIVE: : create indicates that a new file should be created if no file already exists by that name.
如果部分应用程序中的文件不存在于已部署的应用程序EAR中，则更新操作会将其添加到已部署的EAR文件。
If a file in the partial application does not exist in the deployed application EAR, then it is added to the deployed EAR file as a result of update operation.
顺便说一下，如果该文件不存在，那么会创建一个文件。
By the way, in case the file does not exist, then the file will be created.
如果该文件不存在，那么您必须创建它；这个PHP文件还允许用户刷新这个Ami列表。
If the file doesn't exist, you have to create it; the PHP file also gives the user the option to refresh the list of AMIs if he wants.
如果该文件不存在或者有明确请求要求刷新文件，则代码获取存储在Amazon上的所有ami的详细列表。
If the file doesn't exist or there is an explicit request to refresh it, the code gets the list of details for all the AMIs at Amazon.
如果开始的时候 /etc/passwd文件并不存在，那么会发生什么情况呢？
What happens if the /etc/passwd file didn't exist to begin with?
makeinstall过程创建了所需的目录(如果它们都不存在的话)，将文件复制到目标，并运行ranlib，以便为应用程序准备好要使用的库。
The make install process creates the necessary directories (if each doesn't exist), copies the files to the destinations, and runs ranlib to prepare the library for use by applications.
如果您想要看到的图片不存在，那么您可以从文件系统中将文件导入到Encyclopedia文件管理器，并使用该文件。
If the picture that you want to use does not exist there, you can import a file from the file system into the Encyclopedia file manager and use that file.
如果该文件不存在，则创建一个并在文件中键入上面的error _ reporting行即可。
If the file doesn't exist, create it and just type the error_reporting line above into the file.
如果该文件不存在(由文件打开错误确定)，则把“null”状态写入文件。
If the file does not exist (as determined by the file open error), write the "null" state to the file.
如果该文件不存在(由文件打开错误确定)，则把“null”状态写入文件。
If the file does not exist (as determined by the file open error), write the "null" state to the file.
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