findhost.cgi: 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/findhost.cgi - from package: xymon

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

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