dhcping: 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/dhcping - from package: dhcping

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

On Debian possible default full paths are:

/usr/sbin/dhcping - from package: dhcping

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

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