Este script do PowerShell deve fazer o que você quer (testado no Ubuntu 16.04 e no Windows 10)
# Move-FileType.ps1
$Extensions = @('.mov','.jpg','.jpeg')
Get-ChildItem -Directory /root/folder_?? | ForEach-Object {
ForEach ($Ext in $Extensions) {
$DestPath = Join-Path $_.FullName $Ext.Trim('.')
If (!(Test-Path $DestPath)) {mkdir $DestPath|Out-Null}
Get-ChildItem -Path $_ -File -Filter "*$Ext" |
Move-Item -Destination $DestPath -WhatIf
}
}