Replacing words in vi

To replace word in vi, the below steps can be used(replace OLD with NEW). Please make sure you are in command(normal) mode:

1. to replace first occurrence of OLD to NEW on current line
   
• :s/OLD/NEW
2. to replace all occurrence of OLD to NEW on current line
• :s/OLD/NEW/g
3. to replace all occurrence of OLD to NEW between two line numbers (# are the line numbers)
   
• :#,#s/OLD/NEW/g
4. to replace every occurrence of OLD to NEW on current file
• :%s/OLD/NEW/g