idiscover: 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/idiscover - from package: ipmiutil

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

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