cdfvita: 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/cdfvita - from package: cdftools

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