cdfbti: 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/cdfbti - from package: cdftools

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

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