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What happens when a link to an inode goes to zero?
The “rm” command will delete a name-inode map from a directory. When a link count goes to zero in an inode, that means that no directory points to the inode and Unix is free to release and reclaim the disk space used by the inode and its associated disk blocks.
How are soft links different from hard links?
Soft links can reside on different file systems. Every file uses atleast one hard link. So when you create a new file a new directory entry is created which is called link count. So when you create a new hard link to this file the link count increaments by 1.
How does an inode work in a Unix file?
Every file in a Linux/Unix operating system has an inode associated with it with an exception of Solaris ZFS, which does not have inodes. Inodes basically work very similar to an appendix of a book. Every Inode will have below information about the file.
What do you mean by hard link in Linux?
If you remember the symbolic link or the soft link, you know that it points to the file. A hard link is a manually created entry in a directory that points to an already existing inode. I am going to explain it to you with proper diagrams.
Can a directory have the same inode number?
A directory may contain several file names that all map to the same inode number; using any of the several names will map to the same inode number and thus to the same file in the file system. Two different directories may contain identical name-inode mappings; using either pathname will lead to the same inode number and thus to the same file.
Can you create a hard link to a directory in Unix?
Unix permits you to give files many names (“links”); but, not directories. You are not allowed to create a hard link to a directory. Each directory inode is allowed to appear once in exactly one parent directory and no more.
How is the link count of an inode calculated?
link count in the inode keeps track of how many directories contain a name-number mapping for that inode. If an inode has only one name-number map (only one name), its link count is one. If the inode has two name-number maps (two names), its link count is two.