cdfvtrp: 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/cdfvtrp - from package: cdftools

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

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