vi Find And Replace Text Command

In the vi text editor, you can replace text in the following ways:

1. Replace a single instance of a word:

• Position the cursor on the word you want to replace.
• Type r followed by the replacement text.

2. Replace all instances of a word in a single line:

• Press the Esc key to enter normal mode.
• Type :s/old-word/new-word/g to replace all instances of “old-word” with “new-word” in the current line.

3. Replace all instances of a word in the entire file:

• Press the Esc key to enter normal mode.
• Type :%s/old-word/new-word/g to replace all instances of “old-word” with “new-word” in the entire file.

Note: In the above commands, the g at the end of the s command stands for “global”, which means that all instances of the word in the specified range will be replaced, rather than just the first instance. You can omit the g to only replace the first instance.