refdbxml: 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/refdbxml - from package: refdb-clients

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