nomnom: 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/nomnom - from package: nomnom

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

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