rg_test: 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/rg_test - from package: rgmanager

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

On Debian possible default full paths are:

/usr/sbin/rg_test - from package: rgmanager

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

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