xmms2: 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/xmms2 - from package: xmms2-client-cli

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

Error in other languages:
xmms2: bevel nie gevind nie
xmms2: comandă negăsită
xmms2: comando não encontrado
xmms2: commande introuvable
xmms2: command not found
xmms2: käsku ei ole
xmms2: không tìm thấy lệnh
xmms2: komanda nerasta
xmms2: Kommando nicht gefunden.
xmms2: kommandot finns inte
xmms2: komut yok
xmms2: nie znaleziono polecenia
xmms2: níor aimsíodh an t-ordú
xmms2: no se encontró la orden
xmms2: no s'ha trobat l'ordre
xmms2: opdracht niet gevonden
xmms2: parancs nem található
xmms2: perintah tidak ditemukan
xmms2: príkaz nenájdený
xmms2: příkaz nenalezen
xmms2: команда не найдена
xmms2: командата не е открита
xmms2: 命令找不到
xmms2: コマンドが見つかりません