en2ris: 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/en2ris - from package: refdb-clients

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

Error in other languages:
en2ris: bevel nie gevind nie
en2ris: comandă negăsită
en2ris: comando não encontrado
en2ris: commande introuvable
en2ris: command not found
en2ris: käsku ei ole
en2ris: không tìm thấy lệnh
en2ris: komanda nerasta
en2ris: Kommando nicht gefunden.
en2ris: kommandot finns inte
en2ris: komut yok
en2ris: nie znaleziono polecenia
en2ris: níor aimsíodh an t-ordú
en2ris: no se encontró la orden
en2ris: no s'ha trobat l'ordre
en2ris: opdracht niet gevonden
en2ris: parancs nem található
en2ris: perintah tidak ditemukan
en2ris: príkaz nenájdený
en2ris: příkaz nenalezen
en2ris: команда не найдена
en2ris: командата не е открита
en2ris: 命令找不到
en2ris: コマンドが見つかりません