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Figure 21-6. The folder Permissions tab allows you to change its files permissions as well. You can change the group of the folder by selecting the one you want in the Group drop-down list. There are three levels of folder access that you can set at any particular folder for the owner, the group, and everybody else: List Files Only (which really allows read access to the folder), Access Files (which allows read and execute access), and Create and Delete Files (which allows read, write, and execute access). You can also change the permissions applied to the files contained in the folder by selecting the appropriate level in each of the File access dialog boxes: Read-Only or Read and Write. Check the Allow executing file as program box to set the Execute permission on contained files. Click the Apply Permissions to Enclosed Files button to propagate the changes down into the hierarchy. To change the ownership of a file or folder, you need to have root privileges, so make sure you open Nautilus with Gksudo. In the Owner field, select the user.

Also, in Ext2, the block groups that are used as groups of data files can be administered as one entity If you need to see the information about this file system administration, use dumpe2fs followed by the name you want to dump the administrative information for Listing 4-7 shows the result of this command..

Tip Directory permissions are rather strange in that it s easy to set confusing and even illogical permissions. Generally speaking, the day-to-day rules you should follow are simple. If you wish to stop a particular user from accessing a directory, remove all permissions Read, Write, and Execute (rwx). If you wish to make a directory read-only, leave the Read and Execute permissions in place, but remove the Write permission (r-x). It s even possible to make a directory write-only, by leaving the Write and Execute permissions in place and removing the Read permission (-wx). However, it s rare that you would want to do this.

In this chapter, we ve discussed file permissions exclusively in terms of their abbreviations: r for Read, w for Write, and x for Execute This is known as symbolic notation, and its goal is to make file permissions intuitive and easy for the user to understand However, UNIX and Linux file permissions are traditionally expressed as octal notation File permissions are expressed as a series of three numbers ranging from 0 to 7, each of the three numbers representing the Read, Write, and Execute permissions for user, group, and other assignations of the file or directory For example, a file with a permission listing of -rwxr-xr-- can be expressed as 754 in octal notation, and a file permission of -rwxrwxrwx can be expressed as 777 This sounds more complicated than it is.

Note When using a tool like dumpe2fs, you will see information about available inodes. Every file on

Listing 2-13. Creating a View So You Can Use the Same Query Many Times CREATE VIEW PhoneList AS SELECT m.LastName, m.FirstName, m.Phone FROM Member m

It s enough to know that Read permissions have a value of 4, Write permissions have a value of 2, and Execute permissions have a value of 1 Permissions can be added together to make a larger number: Read and Write permissions have a value of 6, for example (4 + 2) The full file permission setting (rwx) has a value of 7 (4 + 2 + 1) In fact, octal notation can consist of four digits, because as with symbolic notation a total of four permission groups can be set: Read, Write, and Execute, and also special file permissions such as the sticky bit, SetUserID, and SetGroupID However, in most cases octal notation file permissions are expressed as three digits It should be kept in mind that, for most tasks, it s not necessary to use octal notation.

every POSIX-compliant file system needs an inode to store its administrative information. On Ext2 and Ext3, inodes are created only when you are creating the file system. Normally one inode is created for about every four data blocks. If, however, you create many very small files, you can run into a situation in which free disk blocks are still available but there are no more available inodes. This will make it impossible to create new files. As an administrator, you can use the dumpe2fs command to get an overview of available inodes on your Ext2 file system.

Symbolic notation is usually enough, and has the added bonus of being less likely to induce a migraine However, when changing some system settings (eg, the umask variable that controls what permissions newly created files have), it s often necessary to specify an octal value Additionally, some Linux and UNIX technical documentation prefers to specify octal notation instead of the more modern symbolic notation..