I was trying to create the SharePoint Site Provisioning using PowerShell. The following PowerShell script will help us to create a SharePoint sites based on Site Address, Site Name and Site Template parameters.

# This is Script to  Create the Sites, based on the Siteadress and Templates, given by the user.
# Use Get-SPWebTemplate cmdlet to get the list of the installed Site templates.


PARAM 
(
[Parameter(Mandatory=$true, Position=0)]
[string] $YourSiteAddress,

[Parameter(Mandatory=$true, Position=1)]
[string] $YourSiteName,


[Parameter(Mandatory=$true, Position=2)]
[string] $YourSiteTemplate
#,

#[Parameter(Mandatory=$true, Position=3)]
#[bool] $OverWrite =$false
)

$OverWrite ='N'
$web = Get-SPWeb $YourSiteAddress -erroraction silentlycontinue
if ($web -ne $null)
{
     Write-Host ("Web site already present with same name : {0}"-f $YourSiteAddress)
     $OverWrite = Read-Host "If want to overwrite the current website Please enter [Y] else enter [N]"
     
    if($OverWrite -eq 'Y')
    {
            Write-Host ("Removing the Site {0}" -f $YourSiteAddress)
            Remove-SPWeb $YourSiteAddress -Confirm:$false -erroraction silentlycontinue
            Write-Host (" {0} - Site Removed" -f $YourSiteAddress)
    }

     $web = Get-SPWeb $YourSiteAddress -erroraction silentlycontinue
}


if($web -eq $null)   
{
    Write-Host ("Creating the Site {0}"-f $YourSiteAddress)
    New-SPWeb     –url $YourSiteAddress     -name $YourSiteName     -template $YourSiteTemplate     –AddToTopNav:$false   

    –UniquePermissions    -UseParentTopNav:$false
 }
else
 {
    Write-Host "use OverWrite =[Y]  to overwrite this Site upon getting the prompt, once you rerun the script"
 }

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