cdfzoom: 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/cdfzoom - from package: cdftools

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

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