19 Jul
2025
19 Jul
'25
1:05 a.m.
On Jul 18, 2025, at 4:59 PM, Larry McVoy <lm(a)mcvoy.com> wrote:
I sort of get "." to repeat the undo but does nvi have a way to redo the
changes you originally did? I've used that to try and track down what
change I did that caused things to break, being able to go back and forth
is useful in a long debugging session.
Let us say you want do undo last 4 changes. You type u...
Now you want to redo 3 of them. You type u..
Basically the second u undoes the undo, and . means repeat!
IIRC, in vi you could only undo one change. To redo you
use u again. vim broke that. nvi extended it compatibly.
[This may be a Europe/USA thing. In US a "toggle" button
seems quite acceptable but perhaps the EU bought into "human
factors design" which says to *not* use the same control for
/opposite/ functions as it can likely increase confusion.
Note: I may be completely wrong here but this was my guess!]