nmzegrep: 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/nmzegrep - from package: namazu2

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

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