vi / vim show line number command

To display line numbers along the left side of a window, type any one of the following:

    :set number
  

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or

    :set nu
  

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You can also define a mapping to toggle the option, for example:

    :nmap <C-N><C-N> :set invnumber<CR>
  

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By pressing Ctrl-N twice in normal mode, Vim toggles between showing and hiding line numbers.

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If you have Vim version 7 or greater, you can change the width of the "gutter" column used for numbering:

    :set numberwidth=3
  

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You can use the number column for the text of wrapped lines:

    :set cpoptions+=n
  

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Finally, you can change the color used for the line numbers. For example:

    :highlight LineNr term=bold cterm=NONE ctermfg=DarkGrey ctermbg=NONE gui=NONE guifg=DarkGrey guibg=NONE
  

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(Fig.01: Vi / Vim line numbers in action - click to enlarge image)

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To turn off line number again enter the same command:

    :set nonumber
  

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or

    :set nu!
  

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If you need number every time you start vi/vim, append following line to your ~/.vimrc file:

    set number
  

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In OSX, edit the vim config file located at:? /usr/share/vim/vimrc

For Ubuntu , the file is located at: /etc/vim/vimrc

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ubuntu vim 顯示行號(hào) Getting VIM to show the line numbers be default