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.
shell脚本中执行定时的基本工具是sleep命令，该命令将使运行中的shell在指定的一段时间内暂停执行。
The basic tool for timing things in a shell script is the sleep command, which causes the running shell to stop execution for a specified time.
PREVIEW命令来看看RMAN能够用来恢复到指定时间的备份，但是这时还没有进行恢复。
PREVIEW command to report, but not restore, the backups that RMAN could use to restore to the specified time.
汇票是由出口商签发的，要求进口商或其代理人在某一规定时间内支付一定金额款项的命令。
A draft is simply an order written by an exporter instructing an importer, or an importer's agent, to pay a specified amount of money at a specified time.
介绍了在不同系统环境下利用系统的命令来实现电子阅览室定时自动关机的方法。
This article introduced the methods of realizing automatic computer shutdown at fixed time in electronic reading room by using different system order.
这有时候可以用来在特定时间内限制玩家可以发送的命令，如在游戏之前的大厅界面上。
This can be useful to restrict the commands that can be issued by players at certain times, such as in a pre-game lobby screen.
这有时候可以用来在特定时间内限制玩家可以发送的命令，如在游戏之前的大厅界面上。
This can be useful to restrict the commands that can be issued by players at certain times, such as in a pre-game lobby screen.
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