Changing File Permissions

Each set of permissions has a numeric code assigned to it, identifying what
type of permissions are assigned to that file or folder. There are a lot of
them, so here are the most common ones that you run into when running a
WordPress Web site:

✦ 644: Files with permissions set to 644 are readable by everyone and
writable only by the file/folder owner.

✦ 755: Files with permissions set to 755 are readable and executable by
everyone, but only writable by the file/folder owner.

✦ 777: Files with permissions set to 777 are readable, writable, and execut-
able by everyone. For security reasons, you should not use this set of
permissions on your Web server unless absolutely necessary.