tomahawk3: 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/tomahawk3 - from package: python3-tomahawk

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

Error in other languages:
tomahawk3: bevel nie gevind nie
tomahawk3: comandă negăsită
tomahawk3: comando não encontrado
tomahawk3: commande introuvable
tomahawk3: command not found
tomahawk3: käsku ei ole
tomahawk3: không tìm thấy lệnh
tomahawk3: komanda nerasta
tomahawk3: Kommando nicht gefunden.
tomahawk3: kommandot finns inte
tomahawk3: komut yok
tomahawk3: nie znaleziono polecenia
tomahawk3: níor aimsíodh an t-ordú
tomahawk3: no se encontró la orden
tomahawk3: no s'ha trobat l'ordre
tomahawk3: opdracht niet gevonden
tomahawk3: parancs nem található
tomahawk3: perintah tidak ditemukan
tomahawk3: príkaz nenájdený
tomahawk3: příkaz nenalezen
tomahawk3: команда не найдена
tomahawk3: командата не е открита
tomahawk3: 命令找不到
tomahawk3: コマンドが見つかりません