vfltest: 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/vfltest - from package: vflib3-bin

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

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