gmerlin_vpsnr: 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/gmerlin_vpsnr - from package: gmerlin

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

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