Explain hard link vs symbolic link.

Here’s a concise comparison of hard links and symbolic links:

Hard Links

• Definition: A hard link is an additional name for an existing file on the disk. Both the original file and the hard link point to the same inode (data on disk).
• Characteristics:
  1. Share the same inode as the original file.
  2. Cannot link to directories (with some exceptions for system files).
  3. Cannot cross file system boundaries.
  4. Remain functional even if the original file is deleted or moved, as long as the hard link exists.
  5. Changes to the content are reflected in all hard links.

Symbolic Links (Symlinks)

• Definition: A symbolic link is a pointer that references another file or directory by its path. It has its own inode.
• Characteristics:
  1. Have their own inode, which is different from the target file.
  2. Can link to directories.
  3. Can cross file system boundaries.
  4. Become broken if the target file is deleted or moved.
  5. Essentially act as shortcuts to the target file or directory.

Example Commands

• Creating a Hard Link:

  ln original.txt hardlink.txt

• Creating a Symbolic Link:

  ln -s original.txt symlink.txt

Summary

• Use hard links when you want multiple names for the same file and want the links to remain valid even if the original is deleted.
• Use symbolic links when you need to link to directories or want a link that can point to files across different file systems.

Let me know if you need further clarification or examples!