Shulou(Shulou.com)06/01 Report--

This article mainly introduces "what are the methods of file management in the CentOS system". In the daily operation, I believe that many people have doubts about the methods of file management in the CentOS system. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what are the methods of file management in the CentOS system?" Next, please follow the editor to study!

Linux assigns a file owner to each file, called the file owner, and gives the file owner a unique registration name. Control of the file depends on the file owner or superuser (root).

The creator of a file or directory has a special right to use the file or directory created, and all relationships of the file can be changed. You can transfer the ownership of the file or directory to other users, but only the file owner or root has the right to change all relationships of the file.

The user can be a user name or user ID. A file is a list of files to change permissions separated by spaces, and the file name can be represented by wildcards. If the ownership of a file or directory is changed, the original file owner will no longer have permissions for that file or directory. System administrators often use the chown command to give users permission to use a file after it has been copied to another user's directory.

The ownership flag of the file is user ID (UID). The chown command changes the ownership of a file or directory. For example, the superuser copies one of his files to the user xu. In order for the user xu to access the file, the superuser (root) should set the owner of the file to xu, otherwise, the user xu cannot access the file. The syntax format of the chown command is:

Chown [options] user or group file 1 [file 2...]

Under Linux, each file belongs to a user group at the same time. When you create a file or directory, the system gives it a user group relationship that can be used by all members of the user group. The flag of the file user group relationship is GID. The GID of a file can only be modified by the file owner or superuser (root). The chgrp command can change the GID of a file, and its syntax format is:

Chgrp [option] group file name, where group is the user group ID. The file name is a list of files to be changed to the group separated by spaces, which supports wildcards.

Every file and directory in the Linux operating system has access permission, which is used to determine who can access and manipulate files and directories in what way. Access rights specify three different types of users: file owners (owner), users in the same group (group), and other users who can access the system (others).

When you use the ls-l command or the l command to display the details of a file or directory, the leftmost column lists the access permissions for the file. The meaning of you is as follows: access rights specify three ways to access a file or directory: read (r), write (w), executable or find (x). Directory access permissions add the-d option after the ls command to understand the permissions of directory files: ls-d

Read permission (r) can list the files stored in that directory, that is, a list of read directory contents. This permission allows shell to use the file extension character to list the matching file names; write permission (w) allows you to delete or add new files from the directory, usually only the directory master has write permission; execute permission (x) allows you to look in the directory and use the cd command to change the working directory to the directory.

File access permission

Read permission (r) means that only specified users are allowed to read their contents, and no changes are allowed to them. Commands that enter the contents of the accessed file require read permission. For example: cat, more, etc.; write permission (w) allows the specified user to open and modify the file. For example, commands vi, cp, etc.; execute permission (x) allows the specified user to execute the file as a program.

At this point, the study of "what are the methods of file management in the CentOS system" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.