Singapore Flyer

Tuesday, April 4, 2017

Search and Replace in Vi editor

Situation:

I have a file called main.html, I need to search and replace _output with OUTPUT.

Steps:

Open the file in vi editor - vi main.html
:%s/_output/g/OUTPUT
Save file

The :substitute command searches for a text pattern, and replaces it with a text string. There are many options, but these are what you probably want:

:%s/foo/bar/g
    Find each occurrence of 'foo' (in all lines), and replace it with 'bar'.

:s/foo/bar/g
    Find each occurrence of 'foo' (in the current line only), and replace it with 'bar'.

:%s/foo/bar/gc
    Change each 'foo' to 'bar', but ask for confirmation first.

:%s/\<foo\>/bar/gc
    Change only whole words exactly matching 'foo' to 'bar'; ask for confirmation.

:%s/foo/bar/gci
    Change each 'foo' (case insensitive due to the i flag) to 'bar'; ask for confirmation.
    :%s/foo\c/bar/gc is the same because \c makes the search case insensitive.
    This may be wanted after using :set noignorecase to make searches case sensitive (the default).

:%s/foo/bar/gcI
    Change each 'foo' (case sensitive due to the I flag) to 'bar'; ask for confirmation.
    :%s/foo\C/bar/gc is the same because \C makes the search case sensitive.
    This may be wanted after using :set ignorecase to make searches case insensitive. 

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