bbhostshow: 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/bbhostshow - from package: xymon

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

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