nagzillad: 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/nagzillad - from package: nagzilla

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

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