perlrdf: 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/perlrdf - from package: perlrdf

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

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