btkbdd: 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/sbin/btkbdd - from package: btkbdd

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