heimdal-kadmin: 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/sbin/heimdal-kadmin - from package: heimdal-workstation

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

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