File Operations - R.D.Sivakumar

1. FILE OPERATIONS
Video Lecture and E-Content Created by
R.D.SIVAKUMAR,M.Sc.,M.Phil.,M.Tech.,
Assistant Professor of Computer Science &
Assistant Professor and Head, Department of M.Com.(CA),
Ayya Nadar Janaki Ammal College,
Sivakasi – 626 124.
Mobile: 099440-42243
e-mail : sivamsccsit@gmail.com website: www.rdsivakumar.blogspot.in

2. CREATING A FILE
 To create a file, we make a system call
specify file name.
 To logical file system will create a new file
by
 Allocating necessary disk storage space.
An entry mode in the directory.

3. WRITING A FILE
 To write a file, we make a system all
specifying both the name of the file and the
information to be written to the file.
 File system searches the directory to find the
location of the file, write the information and
update the write pointer.

4. READING A FILE
 To read from a file, we make a system call
specify the name of the file and its location.
 File system searches the directory to find the
location of the file, read the information and
update the read pointer.

5. REPOSITIONING WITHIN A FILE
 This operation is also known as file “seek”
 File system searches the directory to find the
location of the file and set the current file
position

6. DELETING A FILE
 To delete a file, we make a system call
specifying name of the file.
 File system searches the directory for the
named file and release all file space.

7. TRUNCATING A FILE
 File system erase the particular file but keep
its attributes remain unchanged except for file
length attribute.