What is CHMOD?
CHMOD is a program used on UNIX platforms to change permissions of files. Permissions tell the server who is allowed to run, change, or delete files and programs. Usually if you upload a software script to your server, you would CHMOD it to 755. This will allow the owner of the file to read, write and execute; the group owner to read and execute and anyone to read and execute the file. If you were at the command prompt (shell) on a UNIX server, to CHMOD a file, you would simply type: chmod 755 filename.