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/sbin/rmcp-ping - from package: freeipmi

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

On Debian possible default full paths are:

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

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