nd: 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/nd - from package: nd

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

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