fdnsnamep: 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/fdnsnamep - from package: firedns

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

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