refdbc: 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/refdbc - from package: refdb-clients

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

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