PowerShell：目录检索和语法错误

Question

A little background...
I use Windows XP, Vista, and 7 quite frequently. As such, I constantly have to move my program settings from the %appdata% folder on each PC to the next. I figured that making a PowerShell script to do this for me and remove the folders after I finish would be something to ease my troubles. As I generally have my work on a flash drive, I was hoping to use relative paths, but it seems to be causing me a bit of trouble, but the biggest problem is that I don't seem to understand Powershell enough to know what mistake I'm making and how to fix it... So I came here.

I figured that I could separate the task into two scripts; one for placing the directories and the second for copying them back to the original folder and removing any trace of them behind. I'll show you want I have so far. I figured retrieving them might be more difficult so I started there. Here's what I have so far. I'm using a txt file to make it easy to update the list of folders I want or need transferred so it's also being targeted by a variable.

$fldrtxt = Get-Content .\FolderList.txt
$dirget = -LiteralPath ="'%appdata%'\$_fldertxt"
$dirpost = "./Current"
# get-command | Add-Content .\"$today"_CommandList.txt
Set-Location c: {get-content $_dirget} | %{ copy-item $_dirpost}

I can't get PowerShell to recognize the same command that I use when I use the run utility. Since I'm sure I can use %appdata% to reference where I want the folders taken from and to, how can't I write this script to do what I want? I can use an absolute path, because I'd have to use a separate script for all three computers. And that I don't want.

How can I use PowerShell to do what I want and target the folders I need to use?

Answer 1

First: Accerss the Environment

Since I'm sure I can use %appdata% to reference where I want the folders take from and too

Wrong syntax for PowerShell, the %var% syntax for environment variables is specific to cmd scripts (and carried forward from MS-DOS batch files).

In PowerShell to access environment variables prefix their name with env: , so $env:AppData .

$_dirget = "$env:AppData\$_fldertxt"

Second: Passing parameters

Don't include the parameter name in the variable, a variable passed to a cmdlet will be passed as an argument not a parameter name. You need:

get-content -LiteralPath $_dirget

(There is something call "splat" that allows you to use a hash tables of parameter name-argument pairs as a hashtable, but that's unnecessary here.)