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I'm trying to get a list of all the XSL and XSLT files in a directory.

dir -recurse -filter *.xsl,*.xslt -name

But the following error:

Get-ChildItem : Cannot convert 'System.Object[]' to the type 'System.String' required by parameter 'Filter'. Specified method is not supported.

dir -recurse -filter *.xsl -filter *.xslt -name

But got this error:

Get-ChildItem : Cannot bind parameter because parameter 'Filter' is specified more than once. To provide multiple values to parameters that can accept multiple values, use the array syntax. For example, "-parameter value1,value2,value3".

Can I list both file extensions with a single command?

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up vote 22 down vote accepted
dir .\* -include ('*.xsl', '*.xslt') -recurse
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Note that the () is actually redundant, but I prefer to be explicit. – EBGreen Aug 2 '11 at 18:25

I do not know why, but this one seems to be much faster:

dir .\ -recurse | where {$_.extension -in ".xsl",".xslt"}
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