enadis.cgi: command not found

Have You tried accessing the binary with the full path?

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/enadis.cgi - from package: xymon

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