Chmod Calculator – A Linux Permissions Calculator

Basics of Permissions in Linux

Linux has three user types: owner, group, and others. Each user can have different permissions for files. Here is a reference table explaining the Linux user categories:

User	Description
Owner	The owner is the user who created and owns the file or directory.
Group	The group refers to a collection of members who share common file permissions.
Others	Others include all users who are neither members of the group nor the owner. They can read, write, or execute files based on the permissions set by the owner or the superuser.

In Linux, users have three types of permissions to manage files: read, write, and execute. Here is a reference table of Linux permissions and their descriptions:

Permission	Symbol	Description
Read	r	Allows users to read, view, and download files.
Write	w	Allows users to write content, create, modify, or delete files.
Execute	x	Allows users to execute files, open applications, or run scripts.
No permission	–	Restricts users from reading, writing, or executing files or directories.

These permissions can be represented in two formats: symbolic representation and numeric representation. The numeric notation, like chmod 755, represents file permissions using digits from 0 to 7, where each digit denotes a different permission set. Here is a table illustrating the numeric notation of file permissions:

Permission Value	Binary Representation (rwx)	Permission Description
0	000	No permissions
1	001	Execute permission only
2	010	Write permission only
3	011	Write and execute permissions
4	100	Read permission only
5	101	Read and execute permissions
6	110	Read and write permissions
7	111	Read, write, and execute permissions