cdfw: 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/cdfw - from package: cdftools

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

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