postinst is in acpi-support 0.142.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 | #!/bin/bash
case "$1" in
        configure)
                invoke-rc.d acpid restart>/dev/null
                ;;
        *)
                ;;
esac
 |