Read write execute permissions9/25/2023 The confusion often occurs when you have to start actually setting permissions on your file server. As you can see, there’s not much to them really! That’s the basics of permissions covered. What do all these funny letters and numbers mean?! For folders, this means accessing files in the folder. You can execute (run) the file, if it’s a program or script.For folders, this means creating and deleting files in the folder. For folders, this means listing the contents of the folder. There are three basic things that can be done to files or folders: In UNIX, these 3 types of people are referred to using the letters U (for Owner, or User in UNIX-speak!), G (for Group), and O (for Others). There are three types of people that can do stuff to files – the Owner of the file, anyone in the Group that the file belongs to, and Others (everyone else). If you created the file, then you are usually the owner of that file, and your group, or the group associated with the folder you created the file in, will usually be associated with that file. Every file (and folder) also has an “owner” and a “group” associated with it. On a UNIX web server, every single file and folder stored on the hard drive has a set of permissions associated with it, which says who is allowed to do what with the file. In this tutorial, I’m going to explain the concept of permissions, and show you how to set permissions using your FTP program or via SSH. You need to set the correct permissions on CGI scripts when you install them, to stop those dreaded “500 Server Error” messages. One of the hardest things for the beginner webmaster to get to grips with is how to use chmod correctly to set permissions on files on UNIX and Linux web servers.
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