sbd: 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/sbd - from package: sbd

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