kbdrate: 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/kbdrate - from package: kbd

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

On Debian possible default full paths are:

/sbin/kbdrate - from package: kbd

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

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