Change content of default.aspx for subsites using Powershell

Question

Hi.
I need to update the content of the default.aspx of 60+ subsites in a site Collection. I am able to loop all subsites and get the corresponding default.aspx files using a PowerShell snippet like:
$site = Get-SPSite -WebApplication https://mysite.domain.no/ -Limit All
$wc = $site.allwebs | where {$_.url.StartsWith(https://mysite.domain.no/sites/blahblah/blahblahblah) }
foreach ($web in $wc){
$file = $web.GetFile("default.aspx")
The problem is I don't know whether to use the Set-Content command-let or an XMLDocument approach.
I have the file With the correct content on the local machine. I tried With $file.Parentfolder in order to use
$f = $web.GetFolder($file.ParentFolder)
$fc = $f.files
Get-ChildItem "C:\temp\default.aspx" | foreach {
$spFileCollection.add($($_.Name),$_.OpenRead(), $true)
to replace the file but this gives an error on empty folder. Can I use this approach or is there a way to change the actual content of the file?

Answer 1

Hi Jorgen,
According to your description, my understanding is that you want to update the page content using PowerShell.
I suggest you read the content data like below:
$data = $file.OpenBinary()
$encode = New-Object System.Text.ASCIIEncoding
$test = $encode.GetString($data)
Then you can change the string you want, and then you can save it using SaveBinary() method.
Here are some detailed articles for your reference:
Reading the contents of a SharePoint library file using PowerShell
Using powershell to read/modify/rewrite sharepoint xml document
Best Regards
Zhengyu Guo
TechNet Community Support