bbcmd: 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/bbcmd - from package: xymon

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

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