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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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acpi [options]

Displays information about the ACPI (Advanced Configuration and Power Interface) system, based on the /proc/acpi file. Most kernels after 2.4 support ACPI hardware, and in both hardware and software, ACPI is gradually replacing the older APM (Advanced Power Management) system. Some operating systems, including SUSE, ship a combined ACPI/APM power interface called powersaved. Most, however, require either ACPI or APM software.

Note that some ACPI systems have special events that are not available on others. For example, IBM laptops have events related to their docking stations and keyboard lights that are not used on nondocking or unlighted laptops. On all systems, the /proc/acpi directory must be present for acpi commands to work.


-b, --battery

Display battery information.

-B, --without-battery

Do not display battery information.

-t, --thermal

Display temperature information.

-T, --without-thermal

Do not display temperature information.

-a, --ac-adapter

Show whether the AC adapter is connected.

-A, --without-ac-adapter

Do not show information about the AC adapter.

-V, --everything

Show all information on every device.

-s, --show-empty

Display information even on devices that are not available or not installed, such as empty slots for extra batteries.

-S, --hide-empty

Do not display information on devices that are not operational or not installed.

-c, --celcius

Use degrees Celsius as the temperature unit. This is the default unit.

-d, --directory /path

Use the specified path to ACPI information. The default path is /proc/acpi.

-f, --fahrenheit

Use degrees Fahrenheit as the temperature unit.

-h, --help

Display help information.

-k, --kelvin

Use degrees Kelvin as the temperature unit.

-v, --version

Display version information.

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