pythoncad: 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/pythoncad - from package: pythoncad

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

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