How chmod numbers work explained by example

On the h-sphere site, it defaulted all directories to 705 I ran the install and it said the files were unwritable so I changed them to 755

Hi, Can someone please give me the syntax of the command to set the chmod permission of the directory called example's to 777?

linkdooball 66 Use these commands to change and manage the owner, group, and user permissions on the system Command, Description chmod 777

inwa777 chmod } { File