OS4 Module 3 File Management.ppt - Principles of Operating...

Principles of Operating Systems
Module Number: 03
Module Name:
File Management
Version Code: OS4
Released Date:8-Feb-2021

AIM
•
To understand the concepts of File Management
2
File Management

Objective
• To understand the concepts of File Management
3
File Management

Outcome
•
Understand and implement concepts of File Management
4
File Management

Introduction
● A file is a collection of related information that is recorded or stored on a secondary storage.
●
A file is a named assortment of related data that is recorded on optional stockpiling, for example, attractive
circles, attractive tapes and optical plates.
● When all is said in done, a file is an arrangement of bits, bytes, lines or records whose importance is
characterized by the records maker and client.
5
File Management

FILE TYPES:
ORDINARY FILES:
○
These are the documents that contain client data.
○
These may have text, information bases or executable program.
○ The client can apply different procedure on such records like add, adjust, erase or even eliminate the whole document
DIRECTORY FILES:
○
These documents contain rundown of record names and other data identified with these records.
SPECIAL FILES:
○ These records are otherwise called gadget documents.
○ These documents address actual gadget like plates, terminals, printers, organizations, tape drive and so on
These files have two types −
●
Character special files − data is handled character by character as in case of terminals or printers.
●
Block special files − data is handled in blocks as in the case of disks and tapes.
6
File Management

●
Common File types / File Support :
7
FILE MANAGEMENT
Sl.No. File Type Extension Function
1. Executable exe Read to run machine language program
2. Object Obj Compiled, machine language, not linked
3. Source code C,java,html etc.. Source code in various languages
4. Batch bat It contains commands to the command interpreter.
5. Text Txt, doc It contains textual data and documents
6. Library dll, lib It contains libraries of routines for programmers.
7. Archive Arc, zip,rar Related files grouped into one file, sometimes compressed for archived and
storage
8. Multimedia Mpeg, mp4,mp3 File containing audio,video,images

OPERATION ON FILES
INTRODUCTION:
There are many file operations that can be perform by the computer system.
● File Create operation
● File Delete operation
● File Open operation
● File Close operation
● File Read operation
● File Write operation
● File Relocation operation
8
FILE MANAGEMENT

File Create Operation:
●
The file is created with no data.
●
The file create operation is the first step of the file.
●
Without creating any file, no operation can be performed.
● The purpose of this operation is to announce that the file is coming to set some of the attributes.
●
Some space will be reserved in the hard drive.
9
FILE MANAGEMENT

File Write Operation
●
The file write operation is used to write the data to the file, again, generally at the current position.