How to show line numbers in vi / vim by default in CentOS

Steps:

  1. login as root user (or you can just use su).
  2. Open .vimrc file
    [root@server ~]$vi ~/.vimrc
    
  3. Add this line, then save.
    set number
    

Now everytime you open a file using vi/vim, line numbers will be shown by default.

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