Vi Editor : Search and Replace

Vi as a text editor can search and replace like another text editor. Here’s vi editor’s syntax to add a “#” in front of every line. It is useful when coding and reusing an old script or editing file configuration:

:1,$ s/^/#/g

To “undo” this command (i.e. the inverse):

:1,$ s/^#//g

Useful variant. If you just want the lines below your cursor to have a “#”:

:.,$ s/^/#/g

Another Example (replace)

Replace first match on current line
:s/OLD/NEW

Replace all matches on current line
:s/OLD/NEW/g

Replace matches between lines 10 and 20
:10,20s/OLD/NEW/g

Replace matches from line 10 to the end of file
:10,$s/OLD/NEW/g

Replace matches from cursor to end of file
:.,$s/OLD/NEW/g

Add the word “NEW” in front of every line
:1,$s/^/NEW/g

Source : http://technotes.twosmallcoins.com/?p=18

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