Function Rename-Files
{
param ([string]$FilePath)
$files = Get-ChildItem $FilePath -Recurse
foreach ($File in $Files)
{
$pos = $File.Name.IndexOf(".")
$Left = $File.Name.Substring(0, $pos)
$Right = $File.Name.Substring($pos)
$DefaultFileName = $Left + '.aspx'
if($DefaultFileName -eq "Home.aspx" -or $DefaultFileName -eq "How To Use This Library.aspx")
{
$pos = $File.Name.IndexOf(".")
$Left = $File.Name.Substring(0, $pos)
$Right = $File.Name.Substring($pos+1)
$FullPath = $FilePath +'\'+$File.Name
$NewName = $Left + '_SP2013.' + $Right
Rename-Item $FullPath -NewName $NewName
}
}#Foreach
}