ffcfstress: 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/ffcfstress - from package: joystick

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

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