dwww: 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/dwww - from package: dwww

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