Powershell: subtract $pwd from $file.Fullname

Given the following files:

c:\dev\deploy\file1.txt
c:\dev\deploy\file2.txt
c:\dev\deploy\file3.txt
c:\dev\deploy\lib\do1.dll
c:\dev\deploy\lib\do2.dll

e.g. if $pwd is the following

c:\dev\deploy

running the statement

$files = get-childitem

I want to take this list and using foreach ($file in $files) I want to substitute 开发者_StackOverflowmy own path for the $pwd e.g. I want to print c:\temp\files like the following:

c:\temp\files\file1.txt
c:\temp\files\file2.txt
c:\temp\files\file3.txt
c:\temp\files\lib\do1.dll
c:\temp\files\lib\do2.dll

How can I peform this i.e.

A = c:\dev\deploy\file1.txt - c:\dev\deploy\
B = c:\temp\files\ + A

giving B = c:\temp\files\file1.txt

?

---

I would use filter here and consider piping the files like this:

filter rebase($from=($pwd.Path), $to)  {
    $_.FullName.Replace($from, $to)
}

You can call it like this:

Get-ChildItem C:\dev\deploy | rebase -from C:\dev\deploy -to C:\temp\files\
Get-ChildItem | rebase -from (Get-Location).path -to C:\temp\files\
Get-ChildItem | rebase -to C:\temp\files\

Note that the replacing is case sensitive.

---

In case you would need case insensitive replace, regexes would help: (edit based on Keith's comment. Thanks Keith!)

filter cirebase($from=($pwd.Path), $to)  {
    $_.Fullname -replace [regex]::Escape($from), $to
}

---

There's a cmdlet for that, Split-Path, the -leaf option gives you the file name. There's also Join-Path, so you can try something like this:

dir c:\dev\deploy | % {join-path c:\temp\files (split-path $_ -leaf)} | % { *action_to_take* }

---

How about something like:

function global:RelativePath
{
    param
    (
        [string]$path = $(throw "Missing: path"),
        [string]$basepath = $(throw "Missing: base path")
    )

    return [system.io.path]::GetFullPath($path).SubString([system.io.path]::GetFullPath($basepath).Length + 1)
}    

$files = get-childitem Desktop\*.*

foreach($f in $files)
{
    $path = join-path "C:\somepath" (RelativePath $f.ToString() $pwd.ToString())
    $path | out-host
}

I took the simple relative path from here although there is some problems with it, but as you only want to handle paths below your working directory it should be okay.

---

This works pretty well for me:

gci c:\dev\deploy -r -name | %{"c:\temp\$_"}

---

The accepted answer only works without Sub-Folders

if you need to "convert" Sub-Folders, the Answer of @stej is better.

Here my Version:

 Get-ChildItem -Recurse | ForEach-Object { $_.Fullname.Replace('D:\Work\Test\Release', 'C:\temp\files') }

Note: .Replace doesn't need to be escaped