How to change code display in the post

Hi,
I want to change my code display in the posts like this one:

I want to add select all option and check download links option as this one.

can any body tell me?

Sorry not possible (:

should i make it a poll r not?

To add this option on the code display...

I think the select all is already suggested (:

Please add check download links option plz plz

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