iconfig: 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/iconfig - from package: ipmiutil

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