maruku: 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/maruku - from package: ruby-maruku

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

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