cdfhflx: 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/cdfhflx - from package: cdftools

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

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