ipmi-ping: 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-ping - from package: freeipmi

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

On Debian possible default full paths are:

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

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

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