Chmod Calculator

Table of Contents

About Chmod Calculator

Chmod, short for “change mode,” is a command in Unix and Unix-like operating systems that allows users to change the access permissions of files and directories. Chmod Calculator is an online tool in our calculators family that simplifies the process of converting permissions via a user-friendly interface.

In Linux, the terms used to describe permission numbers like 644 and symbolic notations like r--rwx-wx are as follows:

1. Permission Number: Also known as octal notation or numeric mode. This representation uses a three-digit number to specify the permissions for the owner, group, and others. Each digit can be a value from 0 to 7, where each number is the sum of its constituent permissions (read=4, write=2, execute=1). For example:

   ADVERTISEMENT · REMOVE?
   • 644 translates to rw-r--r--
   • 755 translates to rwxr-xr-x

2. Symbolic Notation: This is also referred to as symbolic mode or text representation. It uses letters to represent the permissions:

3. r stands for read,w stands for write,x stands for execute.
These are grouped for the owner, group, and others. For example:r--rwx-wx represents:
• Owner: read (r--)
• Group: read, write, and execute (rwx)
• Others: write and execute (-wx)

These notations are used in commands like chmod to set file and directory permissions in Linux.

Features

• Matrix Table Input: The tool offers a matrix table with checkboxes to specify the permissions for the owner, group, and others, as well as the read, write, and execute permissions.
• Octal Notation: Chmod Calculator instantly generates the octal notation for the specified permissions, aiding users in setting permissions via the command line.
• Symbolic Notation: Users can quickly obtain the symbolic notation corresponding to the selected permissions, making it easier to understand and implement changes.
• Example Commands: The tool provides sample command line instructions to apply the specific permissions generated, promoting seamless execution.

How to Use Chmod Calculator

1. Select Permissions: Use the matrix table to choose the desired permissions for the owner, group, and others, along with the read, write, and execute checkboxes.
2. View Notations: Instantly observe the octal and symbolic notations generated based on the selected permissions.
3. Apply Commands: Copy the sample command line instructions to apply the permissions as needed in the terminal or command prompt.

Example Usage

• A user wishes to grant read and execute permissions for the owner and group while retaining no access for others. They would simply select the appropriate checkboxes and instantly receive the octal and symbolic notations, along with example commands for implementation.