kappfinder: command not found

Have You tried accessing the binary with the full path?

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/kappfinder - from package: kdebase

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