ipmi-sel: 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/ipmi-sel - from package: freeipmi

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

On Debian possible default full paths are:

/usr/sbin/ipmi-sel - from package: freeipmi-tools

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

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