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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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acpid [options]

Daemon that informs user-space programs about ACPI (Advanced Configuration and Power Interface) events, such as battery warnings, power-supply changes, and laptop lid closings. As ACPI hardware replaces older APM (Advanced Power Management) hardware, acpid replaces apmd. Like other daemons, this application is controlled primarily through a configuration file that determines which events merit action, and what those actions are. In some operating systems, including SUSE Linux and its relatives, all power management is handled by a combined ACPI/APM system called powersave and this daemon is not installed.


-c directory, --confdir=directory

Set the directory used for configuration files. The default directory is /etc/acpi/events. All files in this directory, except those beginning with a period (.), are parsed as configuration files. Typically, a single file is used for each ACPI event to be acted upon.

In the configuration files, blank lines and those beginning with # are ignored. Other lines are expected to consist of a regular expression and a command to be executed when an ACPI event matches the expression.

-d, --debug

Debug mode: run the daemon in the foreground and send all log output to stderr and stdout, rather than a logfile.

-e filename,--eventfile=filename

Set the file used to find events. Normally this is /proc/acpi/event.

-g group,--socketgroup=group

Set the group ownership of the socket to which acpid publishes events. This allows you to restrict which users on the system can access ACPI event information.

-l filename,--logfile=filename

Set the logfile location. Normally, it is /var/log/acpid.

-m mode,--socketmode=mode

Set the permission mode of the socket. Normally, it is 666, with the sticky bit off.

-s filename,--socketfile=filename

Set the file used to define the socket. Normally, this is /var/run/acpid.socket.


Tells acpid not to open a socket at all. Overrides all other socket options.


Print version information and quit.


Print help message and quit.

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