falconeer.fal: 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/falconeer.fal - from package: falconpl-dev

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

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