To turn off my system, I can use one of these three commands:
sudo halt
Or:
sudo poweroff
Or:
sudo shutdown -h now
What are the differences between these commands, or are they all just aliases of each other?
Answers:
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Method 1
halt terminates all processes and shuts down the cpu.
poweroff is exactly like halt, but it also turns off the unit itself (lights and everything on a PC). It sends an ACPI command to the board, then to the PSU, to cut the power.
shutdown is like poweroff, but it also runs shutdown scripts which should stop things gracefully. Examples include giving programs a chance to close files, delete their lock files and unmount drives properly.
Sources:
https://serverfault.com/questions/191537/shutdown-what-is-difference-between-power-off-and-halt
http://osdir.com/ml/os.solaris.managers.summaries/2001-10/msg00027.html
A comment by Peter White
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