zen barcode c# example Delete: As noted in the information above about Write/Add Files, you now give users in Objective-C

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Delete: As noted in the information above about Write/Add Files, you now give users
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the right to eliminate files using the delete flag rather than write.
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Append/Add Directories: This capability is a subset of the POSIX write capability. It
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allows users to create new directories and edit existing files. Note that to create new files, a user must have write privileges. Using chmod, from the command line, you assign the append/add directories privilege using append. The flag is interpreted as add_subdirectory.
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Delete Child: This permission, which applies solely to directories, lets a user to
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delete sub items (provided the user has delete privileges for those items). The delete_child flag assigns the right.
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This section applies solely to directories. You use inheritance to customize how permissions are inherited by a directory s children. For instance, if you apply ACL inheritance to just the first level of subfolders and files, new folders users create will inherit their parents permissions, but items created inside the new folders will not. Likewise, by using the inheret_only flag, you can assign ACLs specifically for inheritance, but not have them apply to the parent object, which can be very useful. You control inheritance with the four separate rights in the following list:
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Apply to this folder: When selected, the ACL will apply to this folder. Otherwise, the
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folder will have only_inherit permission, and the ACL will be active only on children that inherit the ACL.
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Apply to Child Folders: When you activate this option, newly created child folders of
the directory will inherit the ACL. Use the directory_inherit permission to grant this privilege.
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CHAPTER 4: Storage
Apply to Child Files: When enabled, this privilege will cause new files created in the
directory to inherit the ACL. You use the file_inherit permission to grant this right.
Apply to All Descendants: If you activate this option, the inheritance properties of the directory will pass on to newly created directories; allowing for automated propagation of ACLs as users create additional directories and files. Otherwise, the directory you re currently attending to will have the limit_inherit privilege.
Knowing these basics allow you to better grasp Apple s presets: Full Control assigns read, write, and administration capabilities; Read & Write contains the permissions from each respective category. Likewise Read Only and Write Only are limited to their respective categories. When using Apple s presets, full inheritance applies to the folder and its children (both file and directory), as well as to inheritance of inheritance data.
Using chown and chmod to manage permissions
To change POSIX ownership of a file or folder, you use the chown utility. Its syntax is fairly straightforward:
chown owner[:group] /path to file
If all you re doing is changing ownership, you can omit the :group [the colon followed by the actual value for group]. Alternatively, you can use the chgrp command, which has similar syntax, if you merely want to change group ownership. To change ownership, you must either have granted the chown ACL right, or you must be running as root. You can use chmod to manage both POSIX and ACL permissions. Realize, however, that managing ACL s from the command line can be a bit hairy----it s not for the faint of heart. In any case, first though, the basics. As demonstrated earlier, you can use chmod to modify POSIX permissions. The syntax is:
chmod [-R] mode /path to file
As discussed in this chapter s section on fragmentation, the --R option, if used on a directory, applies the mode recursively to all descendents. To modify or create an Access Control Entry (an entry in an access control list) or ACE using chmod, you use the +a, and a flags. For instance, to grant full control of file test.txt to the user hunterbj, run the command
chmod +a "hunterbj allow read,write,execute,delete,append,readattr,writeattr, readextattr,writeextattr,readsecurity,writesecurity,chown" test.txt
Subsequently, you can view the ACLs on that file by passing the e flag to ls as follows:
ls -ael test.txt -rw-r--r--+ 1 hunterbj staff 0 Jul 9 00:56 test.txt 0: user:hunterbj allow read,write,execute,delete,append,readattr,writeattr, readextattr,writeextattr,readsecurity,writesecurity,chown
Likewise, if you want to grant full control for a directory, run:
chmod +a "hunterbj allow list,add_file,search,delete,add_subdirectory,delete_child, readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown, limit_inherit,only_inherit" testfolder
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CHAPTER 4: Storage
To remove an entire ACE, you can use the a# flag followed by an index number, as shown in the first example below, which. Or, if you wish, you can remove only specific attributes as shown in the second command, which removes only delete privileges, leaving the others in place.
chmod a# 0 test.txt chmod a "hunterbj allow delete"
When first applying ACLs or when making changes, you ll likely want to propagate what you ve done to existing files and folders, since inheritance rules apply only at file- or folder-creation time. You can apply permissions recursively via the chmod R +a command, but we d recommended that you do this in Server Admin via its Propagate Permissions menu item, which you can find by clicking on the widget, shown previously in Figure 4-28, directly to the right of the pencil icon a bit above the bottom of the screen. With this method, descendant file-system objects will receive inherited, rather than explicit permissions. When a large portion of your file system contains explicit permissions, management becomes harder. In addition, explicit permissions override inherited permissions, so you might end up with unexpected results. You can create inherited ACEs with chmod as well, though. You do so by using the +ai flag instead of the +a flag. For example, the following commands will set a non-inherited ACE on /MyAwesomeFolder, but will then recursively copy inherited ACE s to all descendants:
chmod +a "hunterbj allow read,write,execute,delete,append,readattr,writeattr, readextattr,writeextattr,readsecurity,writesecurity,chown" /MyAwesomeFolder chmod R +ai "hunterbj allow read,write,execute,delete,append,readattr,writeattr, readextattr,writeextattr,readsecurity,writesecurity,chown" /MyAwesomeFolder/*
TIP: Due to the way that the chmod utility parses the ACE, using the documented syntax for chmod does not work correctly when used with user or group names that contain spaces in the shortname. This creates issues with many Active Directory groups. Fortunately, to get around this issue, you can use the colon as a delimeter. So, to assign an ACL for the group MYCO\Mac Server Admins, the following syntax can be used: chmod +a 'MYCO\Mac Server Admins:allow:read,write,execute' /MyAwesomeFolder You can also remove ACLs via the chmod s --N argument. Combined with --R, you can use chmod to recurse through directories and remove all ACLs. The command syntax is chmod RN /MyAwesomeFolder
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