rfnmz: 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/rfnmz - from package: namazu2-index-tools

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

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