File Operations-R.D.Sivakumar
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The document discusses various file operations including creating, writing, reading, repositioning within, deleting, and truncating files. To create a file, the system allocates disk storage space and makes an entry in the directory. Writing a file involves searching the directory for the file location and writing the information while updating the write pointer. Reading a file searches the directory to find the location and reads the information, updating the read pointer. Repositioning changes the current file position. Deleting a file releases all file space by searching the directory and removing the named file. Truncating erases the file contents while keeping other attributes the same except for length.
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. 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. CREATING A FILE
- 3. 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. WRITING A FILE
- 4. 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. READING A FILE
- 5. 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 REPOSITIONING WITHIN A FILE
- 6. 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. DELETING A FILE
- 7. File system erase the particular file but keep its attributes remain unchanged except for file length attribute. TRUNCATING A FILE