empy: 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/empy - from package: python-empy

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

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