bkhive: 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/bkhive - from package: bkhive

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

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