File management in operating system

This tutorial covers the file concept in os and file management in operating system. In this tutorial we will learn about different types of files in operating system and different operations on file.

File management in operating system

What is file ?
What are different attributes of a file ?
What are different operation to perform on file?
What are types of file?

This tutorial covers the file concept in os and file management in operating system. In this tutorial we will learn about different types of files in operating system and different operations on file.

(A) What is file ?

Generally  a file is a collection of records. A file can also be defined as a named persistent sequential (structured) data repository. The basic idea behind the creation of a file is  that files can be used to store data for long periods of time, and specifically. 

 File as a collection of related information is recorded on the secondary storage like magnetic disk. Magnetic tape and optical disk.

(B) Attributes of file

Under this heading we will learn about different file attributes in os .File’s attributes vary from one operating system to another Operating System. But in general a File may have following file attributes in os.

Name : Every file has a name which is human readable.

Id: Id is a unique number which identifies the file within the file system, generally id is a non human readable name for a file.

Type: This information is needed for system that supports different types of files.

Location: This  attributes of a file is nothing but a information which is a pointer to a device and the location of the file on that device.

Size: Size of file can be defined in term of Bits, Bytes , words or block.

Protection : Protection attribute of file tell the information about the access control which means who can read, write and execute a file.

Time, date and user Identification :  This information may be kept for creation, last modification and last use. This information may be useful for protection, security, and usage monitoring.

file management in operating system

(C) Different operations on file

Here in this section I am going to tell about different file operation in os that can be performed on a file. These Operations are as follows:

Creation : There are two steps which are used to create a file. At first we need to find a space in the file system where we can store the file. Second step is that there should be an entry for the new file  in the directory.

Writing into a File: In Order to write something in  a file at first we make a system call specifying both the name of the file and the information to be written to the file. When we enter the name of the file then system searches the directory to find the file's location. 

The system must put a write pointer  in the file at a location where the next write is to take place. After writing in a file has been complete then writer pointer should be update.

Reading or Accessing a file: To read  or access the data from a file we use a system call that specifies the name of the file and where (in memory) the next block of the file should be place. Again, there is a search in the directory for the related entry and the file system needs to keep a read pointer which point the location in the file where the next read is to perform. 

Once the read operation has been completed the read pointer need to be update. Generally a process is usually either reading from or writing to a file, the current operation location can be kept as a per-process. Read and write operations use this same pointer for saving space and reducing system complexity. We will later describe different file access methods in operating system.

Re-position : To perform the re positioning within a file at first there is a directory correspond to the appropriate entry and the current-file-position pointer is re positioned to a given value. It should be remember that re positioning within a file does not  involve any actual I/0. This operation is also known as file seek.

Deletion:  To delete a file at first  directory is search for the file to be deleted. When the associated file  entry is found  then we release all file space, so that it can be reused by other files and erase the directory entry.

Truncation of a file :  There is difference between truncation of a file and deletion of file. Truncation is performed when user  may want to erase the contents of a file but keep its attributes. Instead of forcing the user to delete the file and then recreate it, this function allows all attributes to remain unchanged –except for file length-but lets the file be reset to length zero and its file space released.

(D) Types of File

different types of file in computer are as shown in following table.

file management in operating system



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Computer Science Junction: File management in operating system
File management in operating system
This tutorial covers the file concept in os and file management in operating system. In this tutorial we will learn about different types of files in operating system and different operations on file.
Computer Science Junction
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