Follow these simple steps and u will be sliding up walls wit daggers!~
Step 1- Get a dagger.
Step 2- Set alternative fire to right click or "F".
Step 3- Go to a map like stairway.
Step 4- Hang off a wall by pressing F.
Step 5- While holding down F,hold down W and repeatedly click and press your Space bar.
Step 6- If you did it right you should be sliding up the wall.