vlc command is not working in root user
 

I am using fedora 24. I install vlc. when i run vlc command in regular user, it works but in root user vlc is working.

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My question is that why vlc command is not working in root user?

I think the message it displayed is self explanatory. You shouldn't be using root outside of system maintenance.

It is for security reasons. VLC usually tells you that it is not meant to be executed by root. Sometimes vlc is setup to download media information and things, so it is quite inappropriate to let vlc run with root privileges.

So it means vlc is not the only command which is not running in root user. which types of applications are not running with root user? Please also tell me from where i can learn more about it?

I suggest marking this solved and posting a new question.

..and vlc has given you the answer:
why even ask?



ok, fair enough.
as a rule of thumb:
- graphical applications
- applications connecting to the network

If this is so important for you, you must compile VLC from sources. What you need is the following option:
.

NO GUI applications should be run as root.

None of the GUI applications can be validated as "safe". There are a few that do use sudo for running some interface applications with connections to servers, but I don't believe these are actually GUI other than display/keyboard input - the actions are actually done by the servers, not the GUI application.