ftangle: 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/ftangle - from package: fweb

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

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