I'm gearing up for the LPI Linux Essentials certification and I can't quite wrap my head around hard links versus symbolic (soft) links. Can someone break down the differences for me in a way that's easy to understand? I'd appreciate some examples, too, if possible!
4 Answers
One key thing about permissions is interesting: you won't have different permissions for hard links from the original file. They share the same inode, which holds the permissions. With soft links, however, the permissions are ignored; they refer to the permissions of the actual target file instead.
Just to clarify, a symbolic link would become broken if the original file it points to gets deleted or moved, while hard links remain valid because they point directly to the inode. It's all about the reference type, really!
That's a solid point! Understanding that dynamic really clarifies how these links function.
Soft links are similar to shortcuts on Windows - just a way to access another file without duplicating it. Hard links, though, work like an entry in a directory that refers to the same physical data without using extra disk space. Even if you create a hard link, it's the same data so any change reflects everywhere!
That’s a handy analogy! The difference between them really helps clear things up.
A symbolic (or soft) link works like a pointer to a file's path. If the original file gets moved or deleted, the soft link becomes a dead end. On the flip side, a hard link points directly to the actual data on the disk, essentially linking to the inode. Since hard links refer to the same inode, both the hard link and the original file are just different names for the exact same thing. If you change one, you change them both!
Great explanation! Just to add, a hard link cannot cross filesystems, while a soft link can point to files on different filesystems. It's a cool distinction to keep in mind!
Exactly! Permissions are per-inode for hard links, but with symlinks, they don’t impact access to the actual file it's pointing to.