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Replace and Substitute

Within vi you can replace a single character, substitute a single character with one or more characters, and substitute a different word for an existing word. For example, to replace a single characters in command mode, we can place the cursor under the character c in the word ants. So a line: 


The circus has many ants.
Will be changed by typing 'rc' (replace with 'c') to: 

The circus has many acts.
To substitute a single character with one or more characters, we can place the cursor under the character i in the word 'in' as follows: 

My salary is one hundred pounds.
Will be changed by typing 'swa' ESC (substitute with 'wa') to: 

My salary was one hundred pounds.
Notice when you type the s command a dollar sign $ appears in the place of the character. To substitute several characters you can precede the command with the number of characters you want to substitute as follows: 

My salary is one million pounds.
Will be changed by typing '2stri' ESC (substitute two characters with 'tri') to: 

My salary is one trillion pounds.
To change a word, you can use the cw (change word) command, while in command mode, as follows: 

My salary is one hundred pounds.
Will be changed by typing 'cwthousand' ESC to: 

My salary is one thousand pounds.
To substitute several words you could do the following: 

Change four words in this line
Will be changed by typing '4cwEdit' ESC to: 

Edit this line.

cc new words
Replace all characters in a line
C new words
Replace remaining characters in the line from cursor
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