refdbxp: 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

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/refdbxp - from package: refdb-clients

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