macping: 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 Debian possible default full paths are:

/usr/bin/macping - from package: mactelnet-client

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

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