Introduction - If you have any usage issues, please Google them yourself
A Text Editor Imlementation 。edit the contents of the file in the input buffer, including: displays the current contents of the file to the first line to the last line to the front line to the next line, and a line to the specified insert a row, delete a row replace the current line, replace a substring, find a substring specified statistical document the number of rows and number of characters, re-read the file, save the current file and exit the system operation