mediathekview: 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/mediathekview - from package: mediathekview

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

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