An Inode is a Data Structure in Unix that denotes a file or a directory on file system. It contains information about file like- location of file on the disk, access mode, ownership, file type etc.
Each Inode has a number that is used in the index table. Unix kernel uses Inode number to access the contents of an Inode.
We can use ls -i command to get the inode number of a file.Read the full book at www.amazon.com