Master Linux Hard, Soft, and Symbolic Links with Practical Commands

In this guide we introduce what file links are in Unix/Linux and how to use them effectively.

Understanding Links

The man ln command displays that ln creates links between files, without distinguishing soft (symbolic) or hard links.

Soft (Symbolic) Links

A soft link creates a new directory entry that points to the target file's pathname; the new file’s inode points to the old file’s inode.

Hard Links

Hard links make the old and new file share the same inode number, so they are indistinguishable at the filesystem level.

Symbolic Links

In many Unix/Linux systems, the terms "symbolic link" and "soft link" are used interchangeably, but the key difference is that a symbolic link has its own inode pointing to the target’s pathname.

Creating Hard Links

Run man ln to view usage.

Without parameters, ln shows a missing operand error.

Create a file (e.g., touch 123.txt) and then link it with ln 123.txt 321.txt.

Verify with ls -l and ls -li to see identical inode numbers.

Delete the source file; the linked file remains because they share the same inode.

Note: Hard links cannot span directories.

Any change to the file content is reflected in all hard‑linked names.

Creating Soft Links

Create a source file src.txt and add content.

Use ln -s src.txt dst.txt to create a symbolic link.

Observe that ls -l shows a different inode and an l permission flag.

Symbolic links can point to directories as well.

Inodes of source and link differ, confirming they are separate entries.

Files created inside a linked directory appear in both the source and target directories.

Removing Links

Soft or symbolic links can be removed with rm <link-name> or unlink <link-name>. Directories that are symbolic links can be removed similarly.

Key Takeaways

Hard links share the same inode; deleting any name does not delete the data until all links are removed.

Soft links have separate inodes and store the path to the target; they break if the target is removed.

Hard links cannot cross filesystem boundaries or link directories, while soft links can.