bb: 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 Debian possible default full paths are:

/usr/lib/xymon/server/bin/bb - from package: xymon

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

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