First, the study notes
Second, the relevant program
Third, there is a problem
1. What is the line editing?
A: The rows of receiving a program or data from a user's input terminal, and stored in the user data area
2. What is the 'shell'?
A: shell is between the operating system and applications command a translation tool.
3. What is the buffer?
A: Buffer cache also known, is a reserved portion of the memory space, is mainly used to input or output data buffer, in accordance with the corresponding input or output device, into the input buffer and output buffer.