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I know that there are several commands that shutdown an Ubuntu computer. I was just wondering if there is a right one to use and what the implications are for using the other ones; or what the various scenarios are for using each of the available commands and their parameters.

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marked as duplicate by fossfreedom Mar 3 '13 at 17:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

for shutdown without administrator password see our Q&A on the dbus way. – Takkat Mar 3 '13 at 9:17
up vote 14 down vote accepted

The right way to shutdown Ubuntu using the CLI(Command Line Interface) is sudo shutdown now.

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Wow! That was fast!. Just saw a similar question and was about to delete this one – muyiscoi Mar 2 '13 at 22:44
On my Ubuntu 12.04 system, this doesn't work. The command completes, but no shutdown is initiated. Adding -h doesn't change this. – Reinier Post Dec 9 '15 at 15:34

You can shutdown safely running:

sudo poweroff
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I suggest using shut down preceded with sync - probably old school but it commits unwritten data to disk - especially useful in multiuser systems. Linux System Administrators Guide

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