cdfkempemekeepe: 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/cdfkempemekeepe - from package: cdftools

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

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