Cenon: command not found

Have You tried accessing the binary with the full path?

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/Cenon - from package: cenon.app

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