mbmon: 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/mbmon - from package: mbmon

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

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