swfdump: 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/swfdump - from package: swftools

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

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