cdfvsig: 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/cdfvsig - from package: cdftools

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

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