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UNIX / Linux shutdown Commands


Shutdown the machine immediately

# shutdown -h now

Reboot the machine immediately

 # shutdown -r now

Shutdown the machine with user defined message

# shutdown -h now 'System is going down for upgrade'

Scheduling the shutdown with 24 hour format

# shutdown -h 20:00
Cancel a running shutdown

You can cancel the running shutdown by using -c option as,

# shutdown -c
 -r Requests that the system be rebooted after it has been brought down
 -h Requests that the system be either halted or powered off after it has been broughtdown, with the choice as to which left up to the system
 -H Requests that the system be halted after it has been brought down
 -P Requests that the system be powered off after it has been brought down
 -c Cancels a running shutdown. TIME is not specified with this option, the firstargument is MESSAGE
 -k Only send out the warning messages and disable logins, do not actually bring thesystem down

See log of system shutdown

# last reboot
 reboot system boot 2.6.18-238.12.1. Sun Jun 5 07:56 (17+00:07)
 reboot system boot 2.6.18-238.9.1.e Sat Apr 30 05:08 (36+02:44)
 reboot system boot 2.6.18-238.9.1.e Fri Apr 22 02:38 (8+02:25)
 reboot system boot 2.6.18-238.5.1.e Sat Mar 5 19:13 (47+06:21)
 reboot system boot 2.6.18-238.1.1.e Sat Jan 22 06:44 (42+12:25)
Solaris

You need to use the shutdown command as follows (you must login as root)

# shutdown -y -g0 -i S

Disclaimer: The views expressed and the content shared are those of the author and do not reflect the views of the author’s employer or techbeatly platform.

Gineesh Madapparambath is the author of the book - 𝗔𝗻𝘀𝗶𝗯𝗹𝗲 𝗳𝗼𝗿 𝗥𝗲𝗮𝗹-𝗟𝗶𝗳𝗲 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻. He has worked as a Systems Engineer, Automation Specialist, and content author. His primary focus is on Ansible Automation, Containerisation (OpenShift & Kubernetes), and Infrastructure as Code (Terraform). (aka Gini Gangadharan - iamgini.com)

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