为什么第二个命令打印出而不是4 ？

Why did the second command print instead of 4?

youdao

例如，echo和print命令打印到标准输出。

For example, the echo and the print command print to standard output.

youdao

命令打印出当前目录下的所有文件和目录列表。

The find . command prints out the list of all files and directories in the current directory and under.

youdao

Is there a command to printf?

是否有个命令来打印？

哈佛公开课 - 计算机科学课程节选