ncdt: 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/ncdt - from package: ncdt

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

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