powercom: 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/powercom - from package: nut

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

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