about_Wildcards

TOPIC
	about_Wildcards

SHORT DESCRIPTION
	Describes how to use wildcard characters in Windows PowerShell.
 

LONG DESCRIPTION
	In many cases, you will want to run a cmdlet against a group of 
	items rather than an individual item. For example, you might 
	want to locate all the files in the C:\Techdocs directory that have a 
	.ppt file name extension. If you were to run the following command, it 
	would return all the items in the directory:

		Get-ChildItem c:\techdocs


	The problem with this command is that you would have to visually 
	inspect all the documents listed in the directory to determine which 
	files use the .ppt file name extension. However, you can limit the items 
	that are returned by using wildcard characters in a cmdlet's parameters. 
	A wildcard character is a type of placeholder that allows you to search
	unknown values in order to return specific results. The process of using 
	wildcard characters is sometimes referred to as "globbing". For example, 
	you can recast the previous example so that only .ppt files are 
	returned:

		Get-ChildItem c:\techdocs\*.ppt


	In this case, the asterisk (*) is used as a wildcard character to specify
	that any characters can exist before the .ppt file name extension. Because
	the file name extension is included, all files returned by the command must
	have that file name extension, but the files can have any name. As a 
	result, only the files that you are looking for are returned.


	Windows PowerShell supports several wildcard characters in addition to the
	asterisk wildcard character.


		Wildcard Description		Example  Match			 No match
		-------- ------------------ -------- ----------------- --------
		*		Matches zero or	a*	 A, ag, Apple	banana
				 more characters

		?		Matches exactly	?n	 an, in, on		ran
				 one character in 
				 the specified 
				 position

		[ ]	Matches a range	[a-l]ook book, cook, look  took
				 of characters
 
		[ ]	Matches specified  [bc]ook  book, cook		hook
				 characters


	Most cmdlets accept wildcard characters in some of their parameters. The 
	Help topic for each cmdlet describes which parameters, if any, permit 
	wildcard characters. For parameters in which wildcard characters are 
	accepted, their use is case insensitive. For example, ?n will return An, 
	an, In, in, On, and on.


	You can also mix wildcard characters within a single parameter. For 
	example, suppose that you want to display all the .txt files in the 
	C:\Techdocs directory that begin with the letters a through l. You can use
	the following command:

		Get-ChildItem c:\techdocs\[a-l]*.txt


	The command uses a range wildcard ([a-l]) to specify that the file name 
	should begin with the letters a through l. The command then uses the 
	asterisk wildcard character to provide a placeholder for any characters
	between the first letter and the file name extension.


SEE ALSO
	about_Language_Keywords