Running a script when the pc shut down

[callkalpa]

I want to run a bash script when my pc shut down.
Suppose the script is myscript.sh
How can I do this ?

[Rubberman]

I don't know what the best solution is, but the script /etc/rc.d/init.d/halt is executed when the system is shut down or rebooted. You could put a call to your script there. Test if it exists, and if so, then execute the script. This would occur before the system terminates and then kills running processes.

[jahangircsebd]

#Perhaps you have to edit your crontab.
#Use the command
crontab -e

[Rubberman]

#Perhaps you have to edit your crontab.
#Use the command
crontab -e

What does cron have to do with shutting down the system? Confusion here...

[collo]

This has nothing to do with cron. Cron schedules jobs at specified time.

if you need to run the script everytime you shutdown, then include a call to your script in /etc/rc.d/init.d/halt

or
including shutdown command inside the myscript.sh so that when you run your script it will shutdown the machine after execution.