enlightenment_open: 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/enlightenment_open - from package: e17

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

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