PowerShell: calculating a relative path
Sometimes you need a simple thing like calculating the relative path of a file given its full path and a base path. For example you have a file c:\a\b\c\d\e.doc and a base path c:\a\b\c, the relative path is now d\e.doc. I use the following PowerShell function to do this, actually using only .Net framework commands;-)
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)
}
Note that I use GetFullPath to get rid of things like .. in a path, like in c:\a\b..\c\d\e.