Change permission to folder Linux

To change directory permissions in Linux, use the following:

1. chmod +rwx filename to add permissions.
2. chmod -rwx directoryname to remove permissions.
3. chmod +x filename to allow executable permissions.
4. chmod -wx filename to take out write and executable permissions.

1. What is the meaning of chmod 777?
2. How do I give 755 permission to a folder in Linux?
3. What is 644 chmod?

What is the meaning of chmod 777?

The command chmod -R 777 / makes every single file on the system under / (root) have rwxrwxrwx permissions. This is equivalent to allowing ALL users read/write/execute permissions. If other directories such as home, media, etc are under root then those will be affected as well.

How do I give 755 permission to a folder in Linux?

Important: The Linux command "chmod" must be entered in lower-case letters. If we implement the command, i.e., chmod 755 filename, we remit everyone to execute and read the file. In this case, the owner of the file is also permitted to write to this file.

What is 644 chmod?

Permissions of 644 mean that the owner of the file has read and write access, while the group members and other users on the system only have read access.