momctl: 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:

/usr/sbin/momctl - from package: torque-mom

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

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