faifa: command not found

Have You tried accessing the binary with the full path?

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/faifa - from package: faifa

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