tunesviewer: 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/tunesviewer - from package: tunesviewer

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

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