File Management and Security

File Manipulation

• File Operations:
  • Create: creating a new file
  • Read: accessing and viewing file contents
  • Update: modifying file contents
  • Delete: removing a file
• File Attributes:
  • Permissions: access control for reading, writing, and executing
  • Ownership: user and group ownership
  • Timestamps: creation, modification, and access times

File Security

• Access Control:
  • User-based access control: controlling access based on user identity
  • Role-based access control: controlling access based on user role
• Encryption:
  • Symmetric encryption: using the same key for encryption and decryption
  • Asymmetric encryption: using a pair of keys (public and private)
• File Permissions:
  • Read (r): allowing read access
  • Write (w): allowing write access
  • Execute (x): allowing execution

File Types

• File Extensions:
  • Identifying file types (e.g., .txt, .jpg, .exe)
  • File associations: linking file extensions to applications
• File Formats:
  • Text files: plain text, ASCII, Unicode
  • Image files: raster (e.g., JPEG, PNG) and vector (e.g., SVG)
  • Binary files: executable files, data files

File Systems

• File System Types:
  • Local file systems: storing files on local devices
  • Network file systems: storing files on remote devices
  • Distributed file systems: storing files across multiple devices
• File Organization:
  • Directory structure: organizing files into folders and subfolders
  • File naming conventions: naming files with meaningful names

Data Storage

• Storage Devices:
  • Hard disk drives (HDD): magnetic storage
  • Solid-state drives (SSD): flash storage
  • Optical storage: CDs, DVDs, Blu-ray discs
• Storage Capacity:
  • Measuring storage capacity: bytes, kilobytes, megabytes, etc.
  • Storage density: increasing storage capacity per unit area

File Manipulation

• File Operations:
  • Creating a new file is known as the "create" operation.
  • "Read" operation allows accessing and viewing file contents.
  • "Update" operation modifies file contents.
  • "Delete" operation removes a file.

File Security

• Access Control:
  • User-based access control grants access based on user identity.
  • Role-based access control grants access based on user role.
• Encryption Methods:
  • Symmetric encryption uses the same key for encryption and decryption.
  • Asymmetric encryption uses a pair of keys (public and private).
• File Permissions:
  • "Read" permission (r) allows read access.
  • "Write" permission (w) allows write access.
  • "Execute" permission (x) allows execution.

File Types

• File Extensions:
  • File extensions identify file types (e.g., .txt, .jpg, .exe).
  • File associations link file extensions to applications.
• File Formats:
  • Text files contain plain text, ASCII, or Unicode.
  • Image files can be raster (e.g., JPEG, PNG) or vector (e.g., SVG).
  • Binary files can be executable files or data files.

File Systems

• File System Types:
  • Local file systems store files on local devices.
  • Network file systems store files on remote devices.
  • Distributed file systems store files across multiple devices.
• File Organization:
  • Directory structure organizes files into folders and subfolders.
  • File naming conventions use meaningful names.

Data Storage

• Storage Devices:
  • Hard disk drives (HDD) use magnetic storage.
  • Solid-state drives (SSD) use flash storage.
  • Optical storage devices include CDs, DVDs, and Blu-ray discs.
• Storage Capacity:
  • Storage capacity is measured in bytes, kilobytes, megabytes, etc.
  • Storage density increases storage capacity per unit area.