Linux and UNIX are among the most used operating systems in the developer's community. To use the operating system in the best way and to be efficient in its operations, you need to know the various commands of the OS. One of the most used and important commands for Linux and UNIX is the chmod command. It is used for changing the permissions of files as well as directories.
If you have a good knowledge about the Linux and UNIX operating systems, you would know that some of the commands are extremely confusing. The chmod commands falling under the same category and are a little complex to remember. Thus it will be easier if you can know the contents of the command for the desired action that you want to take. Since you know that the chmod command is used for changing file permissions, there are different numerical commands that you can get through the calculator.
In the Chmod calculator you would need to enter what permissions you need and once you specify them in a 3x3 matrix, the calculator will give you the desired output. You can take the number sequence and enter it through the chmod command. Through this, it is extremely easy for anyone to apply the command in a Linux environment.
There are three different user levels in any operating systems and these are Owner, Groups and Others. In the calculator, you will find these three listed. There are also three different settings that are available to change for each level of users. Every setting has a numerical value: for read, the numerical value is 4. The same for write is 2 and for execute it is 1. Now when you choose the permissions for each level of users, the calculator calculates the value for each setting.
chmod 644 file.txt // When you want to set the permission of the file.txt to "owner can read and write; group can read only; others can read only", you need to use this command. //
chmod 755 image.jpg // When you use this command, the file permissions of image.jpg is set to "read, write, and execute by owner" and "read and execute by the group and everyone else" //
chmod 666 file.txt // This is a simple command in chmod that means make the file "read and write by everyone". You can also write the same command alphabetically by using chmod a=rw file.txt. //
Once you know how to use the chmod command in the best way, you can get things done in an instant. When you want to change the file permissions in a Linux operating system, you can use it with the help of this calculator for faster implementation.