nvddsinfo: 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/nvddsinfo - from package: libnvtt-bin

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

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