要想从命令行接口引用给定的DB2实例，应该使用环境变量DB2INSTANCE。
To reference a given DB2 instance from a command line interface, use the environment variable DB2INSTANCE.
如果使用了-jar选项，那么环境变量CLASSPATH和在命令行中指定的所有类路径都被j VM所忽略。
The environment variable CLASSPATH and any class path specified on the command line is ignored by the JVM if the -jar option is used.
因此，一个变量只有在没有在任何makefile或命令行中指定时，才会使用环境变量的设置注意：父进程makefile变量有时候会传递下来，但不总会这样。
Thus, environment variables are used only if a variable is not set in any makefile or on the command line. Note: parent makefile variables are sometimes, but not always, passed down.
另外，可以使用一个非常有用的命令查看进程环境变量，即命令pseww。
As an aside a useful command to look at the environment variables of a process is the command ps eww.
可以通过环境变量或使用modify命令动态地设置KDC的调试级别。
Debug levels for the KDC can be set through environment variables or dynamically using the modify command. The syntax for setting debug levels dynamically is.
在此之后，用户就可以使用bashshell环境变量 $PATH 中指定的标准命令集。
The user then has a standard command set of programs available to him or her from within your bash shell environment $PATH variable.
若要使用探查器命令行工具，必须将路径添加到命令提示符窗口的PATH环境变量中，或添加到命令本身。
To use the profiler command-line tools, you must add the path to the path environment variable of the command prompt window or add it to the command itself.
如果在CL环境变量中或在命令行上指定了命令文件，则使用在此命令文件中指定的选项。
If a command file is named in the CL environment variable or on the command line, the options specified in the command file are used.
如果在CL环境变量中或在命令行上指定了命令文件，则使用在此命令文件中指定的选项。
If a command file is named in the CL environment variable or on the command line, the options specified in the command file are used.
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