cli_mt: 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/lib/zookeeper/bin/cli_mt - from package: zookeeper-bin

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

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