ipmitool: 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/bin/ipmitool - from package: ipmitool

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

On Debian possible default full paths are:

/usr/bin/ipmitool - from package: ipmitool

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

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