dvhtool: 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 Debian possible default full paths are:

/usr/sbin/dvhtool - from package: dvhtool

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

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