ratiotool: 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/ratiotool - from package: muddleftpd

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

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