kdmctl: 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 CentOS possible default full paths are:

/usr/bin/kdmctl - from package: kdm

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/kdmctl - from package: kdm

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

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