Shutdown (Linux,AIX,Solaris)

Linux

Shutdown putting server to halt
# /sbin/shutdown -h now

Shutdown with reboot

# /sbin/shutdown -r now
OR
# reboot

You may also use
# halt
# poweroff

Using init command e.g. init 6
0 — Halt
1 — Single-user text mode
2 — Not used (user-definable)
3 — Full multi-user text mode
4 — Not used (user-definable)
5 — Full multi-user graphical mode (with an X-based login screen)
6 — Reboot

AIX

Shutdown and power off bypassing messages to users (No grace period)

# shutdown -F

Shutdown and reboot

# shutdown -Fr

To enter single user user mode, use -m flag

# shutdown -m
OR
# shutdown -m now

Solaris

Shutdown immediately

# shutdown -y -i5 -g0
OR
# sync;sync;init 5
OR
# poweroff

Reboot

# shutdown -y -i6 -g0
OR
# sync;sync;init 6
OR
# reboot

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