Different methods of showing or hiding line numbers in Linux vi / vim text editor

Having difficulties in displaying Linux vi / vim text editor line numbers while modifying or writing a shell script? This guide is for you.

Showing line numbers in Linux vi / vim text editor makes it very easy for users to debug errors or locate a particular line that needs to be modified.
Here at LinuxAPT, as part of our Server Management Services, we regularly help our Customers to debug tasks on their Linux Server.

In this context, we shall look into how to display or hide line numbers in Vim / Vi text editor running on Linux/Unix based systems.

Brief information about vi / vim text editor for Linux

Vi stands for Visual. It is a text editor that is an early attempt to a visual text editor. Vim stands for Vi Improved. It is an implementation of the Vi standard with many additions.
They are very popular among software developers, system administrators and Linux/Unix/macOS users but lines are not displayed by default.

How to make vi/vim text editor show or hide line numbers in Linux?

Just like in Window Notepad ++ html editor, Vim can also be made to display  line numbers in the left margin. To make this happen, simply follow the process presented below;

i. Log into your Server via an SSH tool such as putty and once logged in as the root user, press the "ESC" key.
ii. Next, type in the following command to run on line numbers at the prompt;

set number

iii. To turn off line numbering, simply run the following command;

set nonumber

Below, we shall look into these activities briefly.

How to show line number in Vi or Vim text editor?

In order to display line numbers in the text editor which will be displayed on the left side of the prompt window, execute the following command. But first press the "Esc" key followed by ":". Now enter any one of the following command at a : prompt;

set number

or

set nu

To display relative line numbers in vim or vi, use any of the following;

:set relativenumber

OR

:set rnu

How to turn off line numbering in vim/vi?

To hide line number , simply execute any of the following command;

set nu!

OR

set nonumber

Similarly, to  turn off relative line numbers, use:

:set norelativenumber

OR

:set nornu

How to enable line number setting permanently while using vim?

In cases where you need number every time you start vi/vim, append the following line to your "~/.vimrc" file. Execute the command;

vi ~/.vimrc

Then, Append the following line;

set number

Save and close the file in vim.

How to open a file at particular location/line number?

To go to particular line number from a shell prompt, simply enter;

vi +linenumber file.c

vi +300 initlib.c

To go to particular line that contains main() function from a shell prompt, enter:

vi +/searchTermHere file.c

vi +/main initlib.c

### note shell escape done with \ ###

vi +/addUser\( initlib.c

vi +/addUser\(arg1\) initlib.c

To display minimal number of columns to use for the vim line number

Set following option:

:set numberwidth=N

:set numberwidth=1

:set numberwidth=4

:set numberwidth=10

The minimum value of N is 1, the maximum value N is 10. See this page for more info.

How to list all current vim settings?

To list all available settings, do the following;
At the : prompt, enter:

set all

To see a list of everything that you have set so far in your vim config file or runtime, type the following command at the : prompt:

set

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