How to use FileInfo object from Powershell

I am now starting to use PowerShell and after a lot of time using the Unix shells and want to know how to check for the existence of a file or directory.

In Powershell why does `Exist` return false in the following expression?

PS H:\> ([System.IO.FileInfo]"C:\").Exists
False

And is there a better way to check if a file is a directory than:

PS H:\> ([System.IO.FileInfo]"C:\").Mode.StartsWith("d")
True

> In Powershell why does Exist return false in the following expression?
>
> <PRE>
> PS H:> ([System.IO.FileInfo]"C:\").Exists
> </PRE>

Because there is no file called "C:\" - it's a directory.

In addition to [Michael's answer][1] you could also test using:


PS H:> ([System.IO.DirectoryInfo]"C:\").Exists
True



[1]:

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You can use `Get-Item` to allow PowerShell to select between `FileInfo` and `DirectoryInfo`. It will throw an exception if the path doesn't resolve to a location.

PS> $(Get-Item "C:\").GetType()

IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True DirectoryInfo System.IO.FileSystemInfo

I would only use this over `Test-Path` if you will need the `DirectoryInfo` or `FileInfo` entry if it does exist.

Help Test-Path

Test-Path Determines whether all elements of a path exist

Test-Path -PathType Leaf C:\test.txt
Test-Path -PathType Container C:\
Test-Path C:\

Both of these evaluate to true

$(Get-Item "C:\").GetType() -eq [System.IO.DirectoryInfo]
$(Get-Item "C:\test.txt").GetType() -eq [System.IO.FileInfo]

I see the best answer above using get-item, but original question used [System.IO.FileInfo] so I'll pose an answer.

[System.IO.FileInfo]"C:\Users\carsonk" | select *

Above will show most of the available attributes not shown in the default table view. There are some PS built-in attributes such as PSIsContainer that won't show by select *

PSIsContainer is not available with [System.IO.FileInfo] so

If(([System.IO.FileInfo]"C:\Users\carsonk").directory) {$True}
True

Use `Test-Path` instead of `System.IO.FileInfo.Exists`:

PS> Test-Path -Path 'C:\'
True

You can also use `-PathType` to test whether the location is a file or directory:

PS> Test-Path -Path 'C:\' -PathType Container
True

PS> Test-Path -Path 'C:\' -PathType Leaf
False

`DirectoryInfo` and `FileInfo` also both define a `PSIsContainer` property:

PS> (Get-Item -Path 'C:\').PSIsContainer
True

PS> (Get-Item -Path 'C:\windows\system32\notepad.exe').PSIsContainer
False