The process can then execute one of the system calls in the exec family, which replaces the current running image with the new one.
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。
Exec to change the existing process image with the process to execute.
使用exec将现有进程改变为将要执行的进程。
The exec command can also be used to execute procedures as shown in the example below.
exec命令还可用于执行下面示例中所示的程序。
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