doxypy: 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/doxypy - from package: doxypy

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

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