cdfpendep: 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

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/cdfpendep - from package: cdftools

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