cdfpolymask: 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/cdfpolymask - from package: cdftools

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

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