kdeinit: 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/kdeinit - from package: kdelibs3

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

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