mmk_m2-long: 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/mmk_m2-long - from package: scotch

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

Error in other languages:
mmk_m2-long: bevel nie gevind nie
mmk_m2-long: comandă negăsită
mmk_m2-long: comando não encontrado
mmk_m2-long: commande introuvable
mmk_m2-long: command not found
mmk_m2-long: käsku ei ole
mmk_m2-long: không tìm thấy lệnh
mmk_m2-long: komanda nerasta
mmk_m2-long: Kommando nicht gefunden.
mmk_m2-long: kommandot finns inte
mmk_m2-long: komut yok
mmk_m2-long: nie znaleziono polecenia
mmk_m2-long: níor aimsíodh an t-ordú
mmk_m2-long: no se encontró la orden
mmk_m2-long: no s'ha trobat l'ordre
mmk_m2-long: opdracht niet gevonden
mmk_m2-long: parancs nem található
mmk_m2-long: perintah tidak ditemukan
mmk_m2-long: príkaz nenájdený
mmk_m2-long: příkaz nenalezen
mmk_m2-long: команда не найдена
mmk_m2-long: командата не е открита
mmk_m2-long: 命令找不到
mmk_m2-long: コマンドが見つかりません