cdfstd: 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/cdfstd - from package: cdftools

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

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