Chmod 777: A Definitive Guide To File Permissions

Chmod 777

If you use a Linux device, then you might have encountered the message “Chmod 777” at least once. It is a command of the Unix or Linux systems that can change file permissions and control different terminals. Chmod 777 is a file control mechanism that is associated with this file permissions.  Chmod 777 is essential for Unix system devices.

But do you know about it altogether? Are you aware of what chmod 777  means? Yes, you might have the previous encounter with it, but f you need a clear picture, then you need to know all things related to it. And, this article is the best place to gather knowledge about this command. 

In case you have dealt with the file permissions in the past, then it is a common term for you. You might have encountered this term while changing file permission in your Linux server hosted website. But, the common factor is that you need to have explicit knowledge about it. 

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What is chmod 777 all about?

Chmod is the specific command that regulated everything related to filing permission or modification in a Unix system. If you can understand the mechanism of the Linux or Unix system, then you can easily understand  Linux chmod 777  and its role.

Chmod is the only way you can change the file permission or modify it in your Linux based software. Chmod 777 is the unique mechanism of chmod to control file access. Gathering clear knowledge about it can help you to make your web system foolproof buy controlling the file access permission. 

In any file control mechanism, there are two sections –

Class – Classes come in three subgroups- Group, Owner, and Others. 

Owners- It indicates the person or authority who can modify a specific file whenever they want. Additionally, the Owner can give access to a group of people who can edit or view the selected files. In short, the Owner can control every aspect related to file access permission.

Others- The other people the Owner allows to modify or view files are guests. Their level of access is under the control of the Owner.

Groups –  they are random people who get inited access to files of the system.

Permissions- Now, you know about the people who can change files and modify the permissions in  Unix chmod 777.  But, an owner can grant three types of agreements related to the data. These are-

Read-  A person gets permission only to read the files. They can view files inside folders and read the content. But, there is no permission to edit or delete something.

Write-  A person can read files and add or delete content from the files at their will. They can remove or add or even deletes files from their permitted folders.

Execute-  It provides the proper permission to run files. Such chmod 77 example involves Scripts.

What do you mean by Chmod 777?

In the Unix system, each number code represents the permission or restriction commands. That means, different numbers or number combination indicates different permissions. They are related to any file. In general, an eight-bit binary number can control data and access to those files or folders. The name (000) means that a person does not have any permission to modify or read or even execute a file. 

If you know about the binary number system, then you know that the two numbers 0 and 1 represent every decimal number. 

The binary number(111) indicates all three permissions mentioned above.

In decimal, the number 4 indicates the permission” read”;

The number 1 represents the permission” execute”.

The number 2 represents the command” Write.”

In the case of any files or directory, these three permissions are the same but may have different meanings. 

For example,

a. If a file has the read permission of Chmod 777, then you can read it with the help of a regular text editor. For a folder, you can read all the files inside that particular folder.

b. Any folder or file with the write permission allows users to change the contents and performs tasks like deleting or relocating files and renaming files or folder as per their choice.

c. With the Execute permission, a user can execute the directories with the CD command.

But why are there three numbers? It is a little simple. The three digits in the cluster are the representation of groups, owners, and others. 

In the case of chmod 777,  the first “7” indicates all the permission for the Owner. The second 7 signifies what the groups get to do as per the agreement, and the last number 7 denotes all the access of files for the Others.

chmod 777
chmod 777

A little in detail

Is the method still a little unclear? Then you need to understand it by the mathematical procedure. It is as simple as it gets. 

In the case of  Chmod 777,  the number 7 represents the simple permission- “One class can read, write and execute the permitted files.” 

But why? Then you need to go back to the numbers 4, 2, and 1 and understand their commands. The number 7 is the sum of 4,2 and 1. 

Therefore, in the case of chmod 777, the number denotes that “all classes like the owners, groups, and others can read, write, and execute all types of files.”

Chmod 777
Chmod 777

Changing permissions 

You can change the permission to chmod 777,  with some simple steps-

  1. Right-click on the folders to open “properties” and click on it.

2. Next, click on the “basic” tab and scroll on the “permission” tab. A window will open, and you can change the prs=missions as per your choice.

How to change permission properties
How to change permission properties

You need to save the changes as per your choice.


In the end, the chmod 777  command ensures that everyone can read and access all the content of a file and folder. But, it can become a threat to your system because if you allow everyone to access and modify the files, then you may lose any critical information in the procedure. But, it is an integral part of the chmod command. 


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