kfourinline: 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/kfourinline - from package: kdegames

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

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