beakerlib-rlMemAvg: 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/bin/beakerlib-rlMemAvg - from package: beakerlib

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

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