mge-shut: 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 CentOS possible default full paths are:

/sbin/mge-shut - from package: nut

You may install the required package with command yum install {package}

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