aoeping: 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/aoeping - from package: aoetools

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

On Debian possible default full paths are:

/sbin/aoeping - from package: aoetools

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

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