Command Prompt Install

[marcellokera]

Hello,
I am facing two problems with NSIS scripts. I am new on this but if someone could help me would be great...

I have to do a installer that runs from a command prompt. I have to set some parameter that the user needs to set (I have done that already), but if the user doesn´t pass the parameter the installer should show a message on command prompt usage: installer.exe -d <directory>

the other problem is that when I run the uninstall i have to zip the directory and save to a backup, I saw all the plugins but they just extract zip files they don´t create one...

can anyone help me?