vlc: 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/vlc - from package: vlc-nox

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

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