nagzillac: 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/nagzillac - from package: nagzilla

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

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