Ok, so whenever you have to copy anything in command window, you first require to set command window in mark mode (right click > Mark), and then you can select any content in window.
How about allowing command window to select any content by default without setting it in Mark mode?? You just need to make small modification in your registry.
1. Open your Registry
2. Under [HKEY_CURRENT_USERConsole], find DWORD Value with name QuickEdit.
4. Now double-click this DWORD Value to modify it, which will pop up a dialog box showing Value data as “0″.
5. Modify this value to “1″ and click on “Ok” button to accept this change.
Now open command window and try selecting content by mouse. To copy the selected content, press “Enter” key. For pasting copied content, simply right click on command window, and you are done!
Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. I cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.