ftff: 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/ftff - from package: whichman

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

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