Comment specific lines in VI editor

To Comment specific lines in VI Editor:

 syntax:

:x,y s/^/#/g

x,y -> starting and ending line numbers.

^ -> points to line's begning

# -> usual way to comment in vim

Example:

:450,500 s/^/#/g

(or)
:.,+10 s/^/#/g

 . is current line

 +10 is ten lines from the current.

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