beakerlib-lsb_release: 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-lsb_release - from package: beakerlib

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

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