ibping: 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/ibping - from package: infiniband-diags

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

On Debian possible default full paths are:

/usr/sbin/ibping - from package: infiniband-diags

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

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