wmtv: 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/wmtv - from package: wmtv

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

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