isol: 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/isol - from package: ipmiutil

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

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