mkudffs: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/mkudffs - from package: udftools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mkudffs - from package: udftools

You may install the required package with command apt-get install {package}

Error in other languages:
mkudffs: bevel nie gevind nie
mkudffs: comandă negăsită
mkudffs: comando não encontrado
mkudffs: commande introuvable
mkudffs: command not found
mkudffs: käsku ei ole
mkudffs: không tìm thấy lệnh
mkudffs: komanda nerasta
mkudffs: Kommando nicht gefunden.
mkudffs: kommandot finns inte
mkudffs: komut yok
mkudffs: nie znaleziono polecenia
mkudffs: níor aimsíodh an t-ordú
mkudffs: no se encontró la orden
mkudffs: no s'ha trobat l'ordre
mkudffs: opdracht niet gevonden
mkudffs: parancs nem található
mkudffs: perintah tidak ditemukan
mkudffs: príkaz nenájdený
mkudffs: příkaz nenalezen
mkudffs: команда не найдена
mkudffs: командата не е открита
mkudffs: 命令找不到
mkudffs: コマンドが見つかりません