In-depth analysis of Linux Inode and mastering the file system storage mechanism

In the Linux system, each file and directory has a unique identifier Inode number. Understanding the storage mechanism of Inode is extremely important for a deep understanding of the working principle of the file system. This article will lead readers to deeply analyze Linux Inode, explore the relationship between Inode numbers, files, and directories, and uncover the mystery of the file system storage mechanism.

The inode of the file defines the size of the file, owner and other characteristics of the file. Every file and directory has its own unique inode number. But why use inode to delete files instead of using the commonly used rm -rf command? The reason is that if you accidentally create files and directories with special characters, such as file names with ? * ^, it will be difficult delete. Let’s introduce below: 1) How to find the inode of files and directories; 2) Use the find command to delete specific inode files; 3) Other useful methods for deleting stubborn files.

How to find out the inode of a file?

Use stat or ls -il. The ls command with the -i parameter refers to displaying the inode of the file.

After finding the inode, how to delete this file?

find . -inum [inode数字] -exec rm -i {} /;

1) Let’s do a complete experiment and create a file with special characters:

$ cd /tmp $ touch “/+Xy /+/8″ $ ls

2) Try to delete

$ rm /+Xy /+/8

3) Find out the inode number of this file

$ ls -il 342137 -rw-r–r– 1 tw tw 0 2008-11-20 08:57 /+Xy /+/8

4) 342137 is the inode number we are looking for. Use the find command to delete it

$ find . -inum 342137 -exec rm -i {} /;

For example, if there is a file "2008/11/20" in your system, it cannot be deleted using rm. Linux does not allow you to create this file, but Windows does. So the use of find with inode is here.

You can try to delete the file by adding quotation marks to the file name.

For example, "--help" file can be deleted with rm "--help"

You can also use unlink to delete files.

The unlink command calls the unlink function to delete a specific file.

Use mtools to delete illegal files created under Windows.

This method is most useful when the find command and inode fail. A folder created specifically to deal with the autorun.inf virus.

Through in-depth analysis of Linux Inode, we can not only better understand the storage mechanism of the file system, but also conduct more detailed and efficient management of file reading, writing, search and other operations. At the same time, this also provides us with more ideas and techniques for studying file system performance tuning, thereby improving the overall efficiency of the system. Master the storage mechanism of Inode to make your Linux system management more convenient.

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