cdfvT: 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/cdfvT - from package: cdftools

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

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