Is there any way to comment multiple lines together in vim editor ?

Question

I have a large file which has "some string"so many times, i want it to be replaced with "other string" at all places, using vi or vim editor?
Is there any way to do that?

Answer 1

Yes, it is possible to delete or insert one character or set of characters before multiple lines by going to into visual mode (Ctrl+V)
Then selects multiple lines by doing up / down arrows. Once lines get selected then press "d" to delete the selected columns.

If you want to insert then press (Shift + i) then type character. After doing that press "Esc" so that character will be inserted in all the selected lines.

Answer 2

1. First, go to the first line you want to comment, press Ctrl+V. This will put the editor in the VISUAL BLOCK mode.
2. Then using the arrow key and select until the last line
3. Now press Shift+I, which will put the editor in INSERT mode and then press #. This will add a hash to the first line.
4. Then press Esc (give it a second), and it will insert a # character on all other selected lines. Similarly we can achieve // or any other commenting option.