How do you use PowerShell to export a list of all the sites in a Site Collection?

if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null) {
 Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}

$site = Get-SPSite "http://reinmoto.com/customers"

foreach($s in $site.AllWebs)
 {
 Write-Host $s.title
 Add-Content -Path "C:\file.txt" -Value $s.URL
 $s.Dispose()
 }