What Are Inodes In Linux?

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Inode (Index node) is a data  structure on file system that holds  all information about file except its name and actual data. We can call inode as a identity card without name. When a file is create new name and inode is assigned to it. There is two way to fill a disk. One way is to fill all segments in the file system other way is to consume all inode index numbers. Detaching names from inode gives file systems the ability to hard link which means using same data for multiple files with different name.

Information Stored In Inode

Below information is stored  in inode and each inode is numbered with unique number in file system.

  • File type
  • Permission
  • Owner
  • Group
  • File Size
  • File Access, Deletion and Modification Time
  • Number of Links(soft/hard)
  • Access Control Lists (ACL’s)

List Inode Number

We can list inode number with ls command

  • 1187182 is the inode number of html folder

Alternative way to get inode number and file information is stat command

 

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