beet: 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/beet - from package: beets

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

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