How to Comment and Uncomment Multiple Lines in Vim

press Ctrl + v for visual mode and now press the down arrow key to select till the last line you wanna comment.

Step 3: Press upper case I (shift + i)

and type # or // for commenting depending on the programming language.

and finally press Esc key

wait a sec and it’s done!

Method II

In this method we use substitution to comment out lines.
The first two steps are the same as ‘Method I’.

Step 1: Make sure you are in command mode

Step 2:. Goto the first line you want to comment
press Ctrl+v
and now go down to the last line you wanna comment

Step 3: type :s/^/#  for commenting with #

or

type :s/^/// for commenting with // (we are simply placing a backslash to each since its a special character.)

Note: ‘^‘ is a special search character for the start of the line.

Uncommenting

We can uncomment simply by selecting the commenting characters like # or // and delete them with the x or d key.

Make sure you are in command mode by Pressing the Esc key.

Step 1: Goto to the first line you want to un-comment and press Ctrl+v then press down arrow key to the last line you wanna un-comment. if the comment symbol is more than one character like a ‘//’ then move the cursor to the left/right selecting all the symbols.

Step 2: hit x or d