Commenting multiple lines
Move the cursor to the start line of the comment.
Press ESC to enter insert mode.
Press ctrl+v to enter visua...
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If you aren't opposed to a plugin, I really like
vim-commentaryby tpope, for this! Its language aware so it can use the correct comment for the correct language!github.com/tpope/vim-commentary
With this installed you can do
gccto toggle the comment on a single line, and to do multiple you can select them in visual mode as above, and gogcto either comment or uncomment the lines!