clubufflush: 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/clubufflush - from package: rgmanager

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

On Debian possible default full paths are:

/usr/sbin/clubufflush - from package: rgmanager

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

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