ipmilan: 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/ipmilan - from package: OpenIPMI

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

On Debian possible default full paths are:

/usr/bin/ipmilan - from package: OpenIPMI

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

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