nmzcat: 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/nmzcat - from package: namazu2

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

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