xwiishow: 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/xwiishow - from package: xwiimote

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

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