flatbeh: 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/flatbeh - from package: alliance

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

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