cdctrl: 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/cdctrl - from package: cdtool

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

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