How do I use chmod with numeric permissions?

What does chmod do in Linux?

Chmod is a command in Linux used to change the file system permissions of files and directories.

Can you explain numeric permissions in chmod?

Numeric permissions use three digits to represent the permissions for the owner, group, and others. Each digit can be from 0 to 7.

What do the numbers 0 to 7 mean in chmod?

Each number represents a combination of read (4), write (2), and execute (1) permissions. For example, 7 means read, write, and execute.

How would I set a file to be readable and writable by the owner, and readable by the group and others?

You would use the command chmod 644 filename, where 6 is for read and write for the owner, and 4 is for read for the group and others.