This is the -k option's documentation in man shutdown (at least on Ubuntu):
-k Only send out the warning messages and disable
logins, do not actually bring the system down.
I initially assumed that this will use pam_nologin to lock out logins. However, I tested it out and do not se...
I am not very worried about letting others around me know I don't know much. What I am more worried, if I let them know my existence at SE, is: some people don't have patience but are not happy that I turn to the internet. Some people don't like me to know more than them. Some don't like to know that I think what they told me is wrong.
Some don't understand why I have questions of so much variety and different levels, and worried if I am insane.
@Gilles You have a list of 1128 questions you want to answer when you find time... Wow. I think you may have crossed way past 'genius', through 'eccentric', right on by 'crazy', and headed deeply into 'lunatic'.
There are two ways to feel stupid reading an answer... That is the bad way :-(