dvblast: 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/bin/dvblast - from package: dvblast

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

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