rtax: 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/rtax - from package: rtax

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

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