kreadconfig: 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/kreadconfig - from package: kdebase-runtime

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

On Debian possible default full paths are:

/usr/bin/kreadconfig - from package: kde-runtime

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

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