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About Wildcards

JuanPablo Jofre|Last Updated: 11/17/2016
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2 Contributors

about_Wildcards

SHORT DESCRIPTION

Describes how to use wildcard characters in Windows PowerShell.

LONG DESCRIPTION

Wildcard characters represent one or many characters. You can use them to create word patterns in commands. For example, to get all the files in the C:\Techdocs directory that have a .ppt file name extension, type:

Get-ChildItem c:\techdocs*.ppt

In this case, the asterisk (*) wildcard character represents any characters that appear before the .ppt file name extension.

Windows PowerShell supports the following wildcard characters.

Wildcard Description Example Match No match


Matches zero or aA, 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

You can include multiple wildcard characters in the same word pattern. For example, to find text files whose names begin with the letters "a" through "l", type:

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

Many cmdlets accept wildcard characters in parameter values. 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.

You can also use wildcard characters in commands and script blocks, such as to create a word pattern that represents property values. For example, the following command gets services in which the ServiceType property value includes "Interactive".

Get-Service | Where-Object {$_.ServiceType -like "Interactive"}

In the following example, wildcard characters are used to find property values in the conditions of an If statement. In this command, if the Description of a restore point includes "PowerShell", the command adds the value of the CreationTime property of the restore point to a log file.

$p = Get-ComputerRestorePoint foreach ($point in $p) {if ($point.description -like "PowerShell") {add-content -path C:\TechDocs\RestoreLog.txt "$($point.CreationTime)"}}

SEE ALSO

about_Language_Keywords about_If about_Script_Blocks

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