File Permissions and Types in CentOs 7

File Permissions and Types

Definitions of File Types

• Regular file: Standard files that store data

• Directory: A file that contains other files or directories

• Symbolic link: A shortcut to another file or directory

• Named pipe: A method for processes to communicate with each other

• Socket: An endpoint for sending and receiving data across a network

• Device file: A file that represents a physical device (either a character or a block device)

Owner Permissions

• Read (r): Permission to view the content of the file

• Write (w): Permission to modify the content of the file

• Execute (x): Permission to run the file as a program

Group Permissions

• Read (r): Permission for the group to view the content of the file

• Write (w): Permission for the group to modify the content of the file

• Execute (x): Permission for the group to run the file as a program

Permission States

• Not readable: Indicates that the user/group cannot view the contents.

• Not writable: Indicates that the user/group cannot modify the contents.

• Not executable: Indicates that the user/group cannot execute the file.

Example of ls -l Command Results

• The ls -l command is used to list files in a directory with detailed information about permissions. For example, the output format includes:

  • File type indicator (e.g., - for regular files, d for directories)

  • Owner permissions (read, write, execute)

  • Group permissions (read, write, execute)

Note

• This content is derived from a source owned by Cengage Learning, and copying or distribution is restricted without permission.