mummy: 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/mummy - from package: mummy

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

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