1

in some case I have name of variables with a _ like hello_world.

in vim, in normal mode, with dw, I can delete from cursor position to end of word.

How I can delete from current cursor position to - ?

In the hello_world case, I can make this with df_, but, exist a general way ? (and without delete the _)

3

To delete from the cursor up to but not including the _, type

dt_

I don't know what you mean by a "general way". You can find more here:

:help d
:help motion.txt
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2

My camelcasemotion plugin provides movements and text objects especially for CamelCaseWords and underscore_notation. With it, you can delete hello in your example via d,e.

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