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tell application "Finder" duplicate every file of desktop to disk "Backup Disk" end tell The most useful feature, however, is being able to decide what to do if an item by that name already exists in the container you duplicate to. By default, the Finder will raise an error: An item with the same name already exists in the destination. You can make it replace any existing items automatically by making the optional replacing parameter true: duplicate file the_file_path to folder the_folder_path replacing true One last thing . . . AppleScript allows you to write this: tell application "Finder" copy the_items to folder "Documents" of home end tell as another way of saying this: tell application "Finder" duplicate the_items to folder "Documents" of home end tell Be careful, though: using copy items to container in place of the normal duplicate items to container command works only if container is a literal Finder reference as shown previously. If it s a variable, AppleScript will get the referenced items and assign the result to the variable instead! For example, this will duplicate the items to the user s Documents folder: tell application "Finder" set destination_folder to folder "Documents" of home duplicate the_items to destination_folder end tell but this will assign the items to the variable destination_folder instead: tell application "Finder" set destination_folder to folder "Documents" of home copy the_items to destination_folder end tell You can avoid any confusion by always using the duplicate command for duplicating application objects.

The delete command in the Finder s dictionary doesn t actually delete anything; it just moves the referenced Finder item to the trash. The following: tell application "Finder" to delete file the_file_path is identical to this: tell application "Finder" to move file the_file_path to the trash As with the duplicate command, the delete command can accept a reference identifying multiple items. For example, to delete all the labeled files on the desktop with help from the Finder s powerful whose clause, you can use this: tell application "Finder" delete every file of desktop whose label index is not 0 end tell

Each attribute has a number of properties that control how that attribute behaves. Figure 5-3 shows the attribute properties for CreditLimit. Some of the more commonly used attribute properties are described next.

You can also empty the trash by simply using the empty command: tell application "Finder" to empty trash or just this: tell application "Finder" to empty

Moving files works just like dragging files in the Finder: you have the file or folder you want to move and the folder or disk to which you re moving it. You can also specify whether you want to replace an existing item with the same name using the optional Boolean replacing parameter, as shown in Script 15-4. Script 15-4. (includes the following script) tell application "Finder" to move file the_file_path to container the_folder_path or tell application "Finder" try move file 1 of folder source_folder to folder dest_folder without replacing on error number error_number if error_number is -15267 then display dialog Can't replace the file, replace the scripter instead..." else display dialog "An error occurred: " & error_number end if end try end tell The preceding example asked the Finder not to replace the items if it encounters items with identical names in the destination container. (The default value for the replacing parameter is already false, but I ve put it in anyway for emphasis.) This forces you to place the move command in a try block to capture the error. The preceding example also captured the error that the failed move generated and acted on it. If files already exist, the Finder will generate error number 15267.

The exists command is one of my favorites. It takes one parameter, a reference to the item whose existence is in question, and returns a Boolean: true if the item exists or false if it doesn t: tell application "Finder" exists file "I am here!" of the desktop end tell By the way, a neat trick of AppleScript s is that it lets you put the exists keyword after the reference if you prefer, making the code read more like English: tell application "Finder" file "I am here!" of the desktop exists end tell

persistent This property indicates that the attribute is mapped to a column in the database. You can also have attributes that are not based on database columns, which are called transient attributes. Transient attributes can be useful for representing derived or calculated data. Mandatory This property indicates that the attribute is required. This is automatically set for

The fun thing about this ability to contemplate the existence of files is that because of the clean Boolean result, you can incorporate the command directly into statements that call for a Boolean value, such as if statements: if exists the_file then delete the_file