ipmipower: 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/ipmipower - from package: freeipmi

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

On Debian possible default full paths are:

/usr/sbin/ipmipower - from package: freeipmi-tools

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

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