One of the more useful knots for climbing is the Purcell prusik, which can be used as an adjustable tether or for ascending a rope among other things.

How would one tie it ?

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    @Qudit It might just be personal preference, but if I combined the answers they would be way too long for my taste. I prefer to write them this way as I think smaller, tighter focused questions and answers are better – Charlie Brumbaugh Aug 16 '18 at 18:12
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    Thanks for this question. I learned a new useful knot combination today. – Monster Aug 16 '18 at 19:53
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    Possible duplicate of How do I tie a prusik knot? – Sue Aug 16 '18 at 20:09
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    Possible duplicate of How do I tie a Prusik knot? – paparazzo Aug 16 '18 at 23:19
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    Separate Q. Before this, i knew of prusik-to-other but not of this prusik-to-self. – Martin F Aug 19 '18 at 23:31

Note: You want to keep the double fisherman's knot close to the opposite end, but offset slightly, this gives you maximum adjustability while being able to use the far end as a prusik as well if necessary.

There are two ways I have done this,

  1. Tie a normal prusik (described here) around something and then pull the end of the cordelette through. A stick might work, I have always just used my arm and then pull the end through with my hand.

    Tying a Purcell prusik

    The difficulty with this technique comes from getting the prusik over your wrist as it has a tendency to tighten.

  2. The other is to tie a prusik on a bight and then pass the end of the cordelette through.

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    It should then look like this,

    enter image description here

    From there you add at least one extra loop to each side, although I usually do two, and then pass the end through.

    enter image description here

There is also an animated demonstration of this, and a good description of how it is tied and used here.

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