bcfg2-yum-helper: 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/bcfg2-yum-helper - from package: bcfg2-server

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

On Debian possible default full paths are:

/usr/sbin/bcfg2-yum-helper - from package: bcfg2-server

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

Error in other languages:
bcfg2-yum-helper: bevel nie gevind nie
bcfg2-yum-helper: comandă negăsită
bcfg2-yum-helper: comando não encontrado
bcfg2-yum-helper: commande introuvable
bcfg2-yum-helper: command not found
bcfg2-yum-helper: käsku ei ole
bcfg2-yum-helper: không tìm thấy lệnh
bcfg2-yum-helper: komanda nerasta
bcfg2-yum-helper: Kommando nicht gefunden.
bcfg2-yum-helper: kommandot finns inte
bcfg2-yum-helper: komut yok
bcfg2-yum-helper: nie znaleziono polecenia
bcfg2-yum-helper: níor aimsíodh an t-ordú
bcfg2-yum-helper: no se encontró la orden
bcfg2-yum-helper: no s'ha trobat l'ordre
bcfg2-yum-helper: opdracht niet gevonden
bcfg2-yum-helper: parancs nem található
bcfg2-yum-helper: perintah tidak ditemukan
bcfg2-yum-helper: príkaz nenájdený
bcfg2-yum-helper: příkaz nenalezen
bcfg2-yum-helper: команда не найдена
bcfg2-yum-helper: командата не е открита
bcfg2-yum-helper: 命令找不到
bcfg2-yum-helper: コマンドが見つかりません