nbc: 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/nbc - from package: nbc

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

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