how to manipulate data in .txt file

[David]

there r some student info stored in a text file, the fields r listed as
following:
Student_id Student_name assignment date
how to manipulate this file by adding, delete, search and change a specified
field value.
who can give me some hints, code or related article link on net

thanks

 

[_.-=]

To avoid working with all that code, what we do is use a database ;-)