vim ciw vs cw
Here is an example:
foo bar baz
^
Typing cw and ciw will give the same result in this case (with the cursor
positioned on the 'b' of 'bar'). Consider this:
foo bar baz
^
cw will yield:
foo b baz
^
where ciw will yield:
foo baz
^
so it changes the whole word, regardless of the cursor position. Very
useful, i love this command. Very useful is also the caw (or the aw)
command:
foo bar baz
^
-> caw
foo baz
^
aw also contains the space. Try these commands with the v (visual) command,
to see what they all do. Also, read motion.txt, part 6.