What shows on the screen is just CCNA01# ; as is typical for many devices, though, this prompt actually embeds invisible control characters.
屏幕上所显示的是 CCNA01# ；对于许多设备来说，这是非常典型的，这个提示符实际上嵌入了一些不可见的控制字符。
Reading the source code to see every possible prompt to the user and the scenarios it displays is usually less functional than simply running the program to see what it does.
阅读源代码以查看所有可能的用户提示及其显示的内容，通常没有简单地运行程序看它做些什么来的直观。
What happens in this case is that a "process id" (pid) such as 1234 will be displayed, and then your shell prompt will appear almost immediately, allowing you to type more commands to the shell.
在这个例子中发生的情况是：“进程标识”(pid)如1234将被显示，然后shell提示符几乎立刻会出现，使得您能向shell输入更多命令。
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