kdostartupconfig4: 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/kdostartupconfig4 - from package: kdebase-workspace

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

On Debian possible default full paths are:

/usr/bin/kdostartupconfig4 - from package: kde-workspace-bin

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

Error in other languages:
kdostartupconfig4: bevel nie gevind nie
kdostartupconfig4: comandă negăsită
kdostartupconfig4: comando não encontrado
kdostartupconfig4: commande introuvable
kdostartupconfig4: command not found
kdostartupconfig4: käsku ei ole
kdostartupconfig4: không tìm thấy lệnh
kdostartupconfig4: komanda nerasta
kdostartupconfig4: Kommando nicht gefunden.
kdostartupconfig4: kommandot finns inte
kdostartupconfig4: komut yok
kdostartupconfig4: nie znaleziono polecenia
kdostartupconfig4: níor aimsíodh an t-ordú
kdostartupconfig4: no se encontró la orden
kdostartupconfig4: no s'ha trobat l'ordre
kdostartupconfig4: opdracht niet gevonden
kdostartupconfig4: parancs nem található
kdostartupconfig4: perintah tidak ditemukan
kdostartupconfig4: príkaz nenájdený
kdostartupconfig4: příkaz nenalezen
kdostartupconfig4: команда не найдена
kdostartupconfig4: командата не е открита
kdostartupconfig4: 命令找不到
kdostartupconfig4: コマンドが見つかりません