kfilereplace: 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/kfilereplace - from package: kdewebdev

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

On Debian possible default full paths are:

/usr/bin/kfilereplace - from package: kfilereplace

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

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