xymonpage: 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/xymonpage - from package: xymon

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

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