XINIT [0]
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The xinit program is used to start the X Window System server and a first client 
program on systems that are not using a display manager such as xdm or in 
environments that use multiple window systems. 


Configuration
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Ensure that you have xinit installed first:

+------------------------------------------------------------------------------+
|                                                                              |
|   $ kiss b xinit && kiss i xinit                                             |
|                                                                              |
+------------------------------------------------------------------------------+

Create the required rc file as a regular user:

+------------------------------------------------------------------------------+
|                                                                              |
|   $ touch ~/.xinitrc                                                         |
|                                                                              |
+------------------------------------------------------------------------------+

At this point, you can add content to your .xinitrc file. For example, if you
wanted to start sowm windows manager, you could add the following:

+------------------------------------------------------------------------------+
|                                                                              |
|   $ echo "exec sowm" >> ~/.xinitrc                                           |
|                                                                              |
+------------------------------------------------------------------------------+

You should now be able to start your X server with startx:

+------------------------------------------------------------------------------+
|                                                                              |
|   $ startx                                                                   |
|                                                                              |
+------------------------------------------------------------------------------+


Start After Login
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Add the following to the bottom of your ~/.profile file:

+------------------------------------------------------------------------------+
|                                                                              |
|   $ [ -z "$DISPLAY" ] && [ "$(tty)" = /dev/tty1 ] && exec startx             |
|                                                                              |
+------------------------------------------------------------------------------+

If you would like to remain logged in when the X session ends, remove exec.


References
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[0] https://www.x.org/releases/X11R7.6/doc/man/man1/xinit.1.xhtml
[1] https://wiki.archlinux.org/index.php/Xinit