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[ubuntu] When is "exec openbox-session" required?

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linux-howto

http://ubuntuforums.org – Folks, I have to install openbox on a clean Ubuntu that does not have any GUI yet. The steps I had written down were: $ sudo apt-get install xorg $ sudo apt-get install openbox $ vi ~/.xinitrc and create a line "exec openbox-session" $ startx I accidentally missed the step of creating ~/.xinitrc file and just ran the final step "startx." What I noticed was that openbox did start to run. I am a bit confused. How is openbox running even though I did not specify "exec openbox-session" in .xinitrc? If this step was not mandatory, when is it needed? Thank you in ad (Hardware)