zleave: 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/zleave - from package: zephyr-clients

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

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