ihpm: 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/ihpm - from package: ipmiutil

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

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