ne's manual

4.4: Clip Commands

These commands control the clipping system. ne can have any number of clips, which are distinguished by an integer index. Most commands act on the current clip, which can be selected with ClipNumber. Note that clips can be copied and pasted in two ways---normally or vertically.

Note that by using the Through command you can automatically pass a (possibly vertical) block of text through any filter (such as sort under UN*X).