zizler: 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/zizler - from package: undertaker

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

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