catod: 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/bin/catod - from package: freewnn-cserver

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