FaCT++: 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/FaCT++ - from package: fact++

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

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