isel: command not found

Have You tried accessing the binary with the full path?

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/isel - from package: ipmiutil

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