richcomm_usb: 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:

/sbin/richcomm_usb - from package: nut

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

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