kfind: 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/kfind - from package: kdebase

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

On Debian possible default full paths are:

/usr/bin/kfind - from package: kfind

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

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