Powershell：从 $file.Fullname 中减去 $pwd

Question

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

eg 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 my own path for the $pwd eg 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 ie

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

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

?

Answer 1

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
}

Answer 2

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.

Answer 3

这对我来说非常有效：

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

Answer 4

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* }

Answer 5

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