rxp: 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/rxp - from package: rxp

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

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