mysql -uroot -pYourPassword -e "source C:tempfilename.SQL"

mysql --user=root --password=YourPassword --execute="source C:tempfilename.SQL"

get-content filename.sql -readcount 1000 |% {$_ | mysql -uroot database}

$reader = [IO.File]::OpenText($filetoread)
while ($reader.Peek() -ge 0) {
   $line = $reader.ReadLine()

   #do your thing here

}
$reader.Close()

Get-Content .buTable.sql | mysql -uuser -ppassword destDatabase