So, if the entry in$ directory exists and is a directory ( the-d operator), the test succeeds, evaluation ends, and the continue command, which skips processing of the current element, never executes. 因此,如果$directory中的条目存在,并且是一个目录(-d操作符),则测试成功,求值结束,并且continue命令(它跳过当前元素的处理)永远不会执行。
The semicolon is a shell control operator, and while it is useful for stringing together multiple discrete commands on a single command line, it does not work for everything. 该分号是Shell控制操作符,虽然它对于在单个命令行上将离散的命令串联起来很有用,但它并不适用于所有情况。
There is also a Java package-level trace that can be enabled using this operator command 还存在Java包级跟踪,其可以通过使用以下运算符命令启用
Similarly, the|| control operator separates two commands and runs the second command only if the first command returns a non-zero exit status. 类似地,控制操作符分隔两个命令,并且仅当第一个命令返回非零退出状态时才运行第二个命令。
Better yet, the pipe operator assembles ad hoc programs right at the command line. 更好的是,管道操作符可以在命令行上组装出专门的程序。
We figure out that it calls a piped system command ( prtconf| grep Memory) through the backtick operator, and the prtconf command is specific to Solaris. 通过backtick操作符,我们断定它调用一个管道系统命令(prtconfgrepMemory),而prtconf命令是特定于Solaris的。
Operator control language command 操作员控制语言命令
The operator can assign a physical device to a logical device name through this command, as describe in the second chapter. 正如在第二章里所描述的,操作员通过这个命令,能把一个物理设备分配给一个逻辑设备名。
Main storage space is allocated for it dynamically and is freed after the operator command contained within the CIB has been processed. 该区在主存空间是动态分配的,并且在该缓冲区中的操作员命令得到处理之后就被释放。
Basic operator control command 基本操作员控制命令
Due to nobody operate at present, it is impossible to view the state of the sample machine, so it make the operator difficult to know the effect of the control command. 由于现场无人操作,无法监视采样机的状态,使得操作人员难以确定控制命令的效果。
Every peripheral unit controlled 16 munitions located 20m away from it. Operator sent information into central unit according to armament function, and decoded instruction was sent into peripheral unit to control power supply device, and command armament blast. 每个外设单元控制与它相连接20m远的16路军备,操作员根据军备功能决定传送信息给中央单元,经解码后传送指令到外设单元并控制电源设备、指挥军备的爆炸。
If necessary operator give a command for auto-start or auto-stop. 运行工程师只需在必要时发出启动或停止指令。
The operator only needs to give the command to the underwater vehicle, which will complete the tactical and strategic missions by itself. 操作人员只需下达使命给水下机器人,与战术甚至与战略有关的任务,都由水下机器人自主完成。