kdestroy: 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/lib/heimdal/bin/kdestroy - from package: heimdal-workstation
/usr/bin/kdestroy - from package: krb5-workstation

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

On Debian possible default full paths are:

/usr/bin/kdestroy - from package: krb5-user

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

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