exec的工作是将当前进程替换为一个新进程。
The job of exec is to replace the current process with a new process.
这里的进程替换运行目录列表组件并返回一个文件名列表，后者又提供给emacs命令的参数列表。
Here the process substitution runs the directory listing components and returns a list of filenames, which is in turn supplied to the argument list of the emacs command.
在大多数Shell环境中，您都可以使用基本的进程替换来将一个命令的输出嵌入到另一个命令的输入或参数中。
Within most shell environments, you can use basic process substitution to embed the output of one command into the input or arguments of another.
但通常会将其作为一个问题看待，特别在使用可以从多个位置初始化的实时进程替换基于文件的批处理进程时更是如此。
But it is often identified as an issue, especially when file-based batch processes are being replaced with real-time processes that can be initiated from multiple places.
这使得在从SPU上运行的进程进行抽象的底层单元时，替换物理上的SPU成为可能。
This makes it possible to replace physical SPUs as the underlying unit of the abstraction from processes running on the SPU.
例如，可以在不停止策略所属的整个软件进程的情况下删除并替换该策略。
For example, a policy can be removed and replaced without stopping the overall software process in which it plays a part.
相关扩展包括替换命令和针对不同进程重定向信息的更好方法。
Extensions include better ways of substituting commands and redirecting information in and out to different processes.
这表明正在运行的进程已被新进程所替换。
This shows that the running process is replaced by the new process.
AIXVMM提供了一些后台守护进程，专门负责进行分页替换。
The AIX VMM has background daemons responsible for doing page replacement.
然后该进程可以执行exec系列中的某个系统调用，从而将当前运行的映像替换为新的映像。
The process can then execute one of the system calls in the exec family, which replaces the current running image with the new one.
其中一个分页替换守护进程称为lrud（显示为ps-k的输出中的 lrud）。
A page replacement daemon is referred to as lrud (shows up as lrud in the output of ps -k).
您可以使用各种系统可调参数来控制AIX分页替换守护进程的行为，并控制AIX处理不同类型分页的分页替换的方式。
You can use system tunable parameters to control the behavior of the AIX page replacement daemons and control how AIX treats different classes of pages page replacement.
如果该分页没有经过修改，那么分页替换守护进程可以简单地将物理内存块标记为空闲，这样一来，就可以将该物理内存块重用于另一个分页。
If the page is unmodified, the page replacement daemon can simply mark the physical memory block as free, and the physical memory block can then be re-used for another page.
AIX分页替换守护进程一次扫描内存的一个分页，找出要回收的分页以释放内存。
The AIX page replacement daemons scan memory a page at a time to find pages to evict in order to free up memory.
如果该分页经过了修改，那么分页替换守护进程将该分页写入到辅助存储位置(例如，分页空间或者文件系统磁盘)。
If the page is modified, the page replacement daemon writes the page out to a secondary storage location (for example, paging space or file system disk).
在这种仅客户端的模式中，AIX分页替换守护进程将严格地选择客户端分页进行操作。
In this client-only mode, the AIX page replacement daemons strictly target client pages.
为了帮助分页替换守护进程更好地选择用来进行替换的分页，AIX将分页分为下面两种类型。
In order to help optimize which pages are selected for replacement by the page replacement daemons, AIX classifies pages into one of two types.
exec命令还启动另外一个命令，但是与产生新进程不同，exec 使用一个新命令来“替换”当前进程——即Shell 进程——的任务。
The exec command also launches a command, but instead of spawning a new process, exec "replaces" the task of the current process -- that is, the shell (or script) process -- with the new command.
我们只是替换想要保护的守护进程，本例中是用tcpd替换ftpd和telnetd。
We simply replace the daemons that we wish to protect, in this case FTPD and telnetd with TCPD. So, after editing we would have the following configuration change.
辅助进程回收替换应用程序在内存中的一个实例。
Worker process recycling replaces an instance of the application in memory.
中断指令将控制传递给内核句柄，后者在执行替换函数执行之后，返回来继续执行该进程。
The interrupt instruction passes control to a kernel handler, which after executing a replacement function, returns to continue executing the process.
中断指令将控制传递给内核句柄，后者在执行替换函数执行之后，返回来继续执行该进程。
The interrupt instruction passes control to a kernel handler, which after executing a replacement function, returns to continue executing the process.
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