Disabling Shutdown Via Ctrl-Alt-Del on a Linux box

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By default, the /etc/inittab specifies that your system will reboot on pressing the Ctrl-Alt-Del key combination used at the console. To completely disable this feature, comment out the following line in /etc/inittab file (you will need admin privileges for this) by putting a hash mark (#) in front of itand save the file:

ca::ctrlaltdel:/sbin/shutdown -t3 -r now

You may also want some non-root users to be still able to shutdown the system using Ctrl-Alt-Del key combination, and for this provisions are available. Do the following:

Add the -a option to the /etc/inittab line shown above, so that it reads:
```
ca::ctrlaltdel:/sbin/shutdown -a -t3 -r now
```
Create a file named shutdown.allow in /etc. The shutdown.allow file should list the usernames of any users who are allowed to shutdown the system using Ctrl-Alt-Del , as shown beloW: