ipmi-power: 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/ipmi-power - from package: freeipmi

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

On Debian possible default full paths are:

/usr/sbin/ipmi-power - from package: freeipmi-tools

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

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