kioclient: 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/kioclient - from package: kdebase-runtime

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

On Debian possible default full paths are:

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

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

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