This episode discusses the basics of how permissions work in UNIX and how they are divided into distinct classes for Users, Groups and everyone else.

This episode describes the symbols used by the `chmod` command to manipulate file and directory permissions in UNIX.

This episode shows how to use the `chmod` command to manipulate read permissions for the owner of a file.

This episode shows how to use the `chmod` command to manipulate write permissions for the owner of a file.

This episode shows how to use the `chmod` command to manipulate execute permissions for the owner of a file.

This episode shows how to use the `chmod` command to manipulate read permissions for the owner of a directory.

This episode shows how to use the `chmod` command to manipulate write permissions for the the owner of a directory.

This episode shows how to use the `chmod` command to remove execute permissions for the owner of a directory.

This episode shows how we can comma-delimit permissions for the various classes when using the `chmod` command.

This episode shows how applying the X flag with the `chmod` command can be used as a shortcut for setting execute permissions for a file.

This episode shows how to apply the X flag when using the `chmod` command to specify execute permissions for a directory.

This episode shows how to use the `chmod` command to apply the setuid flag (or bit) for the owner of a file.

This episode shows how to use the `chmod` command to apply the setgid flag (or bit) to the group of a file.

This episode describes the sticky bit as a method for allowing directories to be append-only.

This episode shows how files can be deleted from directories when the sticky bit is set, provided that the proper ownership and permissions are already in place.

This episode shows how files cannot be deleted from directories when the sticky bit is set when the file's owner is not the same as the current user.

This episode shows how the sticky bit changes depending on whether the execute permissions are set or not for a directory.

This episode shows how extended attributes can be identified for a directory and how that information can be obtained using the `xattr` command.

This episode describes how the `chmod` command can use an alternative format to `symbolic notation` for specifying permissions. That alternative format is called `numeric notation` and a brief example is provided to compare the two formats.

This episode describes a brief introduction to the binary numbering system and how it applies to file or directory permissions.

This episode shows examples of files and directories with symbolic notation and how those same permissions can be applied using the `chmod` command while using numeric notation.

This episode describes the numeric values that are assigned for the setuid, setgid and sticky bits.

This episode shows how to use the `chmod` command to apply the setuid flag to a file using numeric notation.

This episode shows how to use the `chmod` command to apply the setgid bit to a file using numeric notation.

This episode shows how to use the `chmod` command to set the sticky bit for a directory using numeric notation.