why2html: 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/bin/why2html - from package: why

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

Error in other languages:
why2html: bevel nie gevind nie
why2html: comandă negăsită
why2html: comando não encontrado
why2html: commande introuvable
why2html: command not found
why2html: käsku ei ole
why2html: không tìm thấy lệnh
why2html: komanda nerasta
why2html: Kommando nicht gefunden.
why2html: kommandot finns inte
why2html: komut yok
why2html: nie znaleziono polecenia
why2html: níor aimsíodh an t-ordú
why2html: no se encontró la orden
why2html: no s'ha trobat l'ordre
why2html: opdracht niet gevonden
why2html: parancs nem található
why2html: perintah tidak ditemukan
why2html: príkaz nenájdený
why2html: příkaz nenalezen
why2html: команда не найдена
why2html: командата не е открита
why2html: 命令找不到
why2html: コマンドが見つかりません