oneac: 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/oneac - from package: nut

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

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