systemd-sleep customizations stub

system-sleep

- `/usr/lib/systemd/system-sleep`
  - `chmod +x`

```shell
#!/bin/bash
## REMARK:
# - above shebang is required for scripting file
# - 1st arg passed to executable file is either "pre" (mean that the entry of a power operation) or "post" (mean that the exit of a power operation)
# - 2nd arg passed to executable file is either "suspend", "hibernate", "hybrid-sleep", or "suspend-then-hibernate", depends on what power operation is operating
# - SYSTEMD_SLEEP_ACTION environment variable is helpful for "suspend-then-hibernate", it has value of either  "suspend", "hibernate", or "suspend-after-failed-hibernate"
case $1 in
    pre)
        case $2 in
            hibernate)
                ;;
            hybrid-sleep)
                ;;
            suspend)
                ;;
            suspend-then-hibernate)
                case $SYSTEMD_SLEEP_ACTION in
                    suspend)
                        ;;
                    hibernate)
                        ;;
                    suspend-after-failed-hibernate)
                        ;;
                esac
                ;;
        esac
        ;;
   post)
        case $2 in
            hibernate)
                ;;
            hybrid-sleep)
                ;;
            suspend)
                ;;
            suspend-then-hibernate)
                case $SYSTEMD_SLEEP_ACTION in
                    suspend)
                        ;;
                    hibernate)
                        ;;
                    suspend-after-failed-hibernate)
                        ;;
                esac
                ;;
        esac
        ;;
esac
```

[SEE ALSO](https://www.freedesktop.org/software/systemd/man/systemd-suspend.service.html)