mz: 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/sbin/mz - from package: mz

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

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