cdf16bit: 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/cdf16bit - from package: cdftools

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

Error in other languages:
cdf16bit: bevel nie gevind nie
cdf16bit: comandă negăsită
cdf16bit: comando não encontrado
cdf16bit: commande introuvable
cdf16bit: command not found
cdf16bit: käsku ei ole
cdf16bit: không tìm thấy lệnh
cdf16bit: komanda nerasta
cdf16bit: Kommando nicht gefunden.
cdf16bit: kommandot finns inte
cdf16bit: komut yok
cdf16bit: nie znaleziono polecenia
cdf16bit: níor aimsíodh an t-ordú
cdf16bit: no se encontró la orden
cdf16bit: no s'ha trobat l'ordre
cdf16bit: opdracht niet gevonden
cdf16bit: parancs nem található
cdf16bit: perintah tidak ditemukan
cdf16bit: príkaz nenájdený
cdf16bit: příkaz nenalezen
cdf16bit: команда не найдена
cdf16bit: командата не е открита
cdf16bit: 命令找不到
cdf16bit: コマンドが見つかりません