shutdown — Bring the system down (Needs Root privilege)
shutdown brings the system down in a secure way. All logged-in users are notified that the system is going down, and login is blocked. All processes are first notified that the system is going down by the signal SIGTERM. Runlevel 0 is used to halt the system, runlevel 6 is used to reboot the system. However please take care not to use this command on production systems.
# shutdown 12:00 — Shutdown at 12:00
# shutdown +10 — Shutdown after 10min
# shutdown now — Immediate shutdown (now == +0)
# shutdown -t 10 — Wait 10 Sec after warn the user
# shutdown -k — Don’t really shutdown; only warn
# shutdown -r -t 5 — Reboot after shutdown
# shutdown -h -t 5 — Halt after shutdown
# shutdown -f now — Skip fsck (File System Check) on reboot
# shutdown -F now — Force fsck on reboot
# shutdown -c — Cancel the already waiting shutdown process.
Read : man shutdown
There has been a great deal of flooding in Chennai, India due to the heavy rain yesterday and there was no power in the morning. I have written about the plight of people due to the floods in my personal blog.