The shutdown configuration in sysfs

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The configured shutdown action for each shutdown trigger is stored in a sysfs attribute /sys/firmware/shutdown_actions/on_<trigger>.

This graphic shows the /sys/firmware/shutdown_actions directory with the contained attributes on_halt, on_poff, on_reboot, on_restart, and on_panic. — Figure 1. sysfs branch with shutdown action settings

The preferred way to read or change these settings is using the lsshut, chshut, and dumpconf commands. Alternatively, you can read and write to the /sys/firmware/shutdown_actions/on_<trigger> attributes.

Examples

This command reads the shutdown setting for the poff shutdown trigger.
```
# cat /sys/firmware/shutdown_actions/on_poff
stop
```
This command changes the setting for the restart shutdown trigger to ipl:
```
# echo ipl > /sys/firmware/shutdown_actions/on_restart
```

Details for the ipl, reipl, dump, and vmcmd shutdown actions are contained in the corresponding subdirectories in /sys/firmware. For example, /sys/firmware/ipl contains specifications for an IPL device and other IPL parameters.