rmcp_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/bin/rmcp_ping - from package: OpenIPMI

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

On Debian possible default full paths are:

/usr/bin/rmcp_ping - from package: OpenIPMI

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

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