vdr-newplugin: 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
/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/vdr-newplugin - from package: vdr-dev

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