acpid
This is the daemon for the Advanced Configuration and Power Interface (ACPI). ACPI is an open industry standard for system control related actions, most notably plug-and-play hardware recognition and power management, such as startup and shutdown and putting systems into low poser consumption modes.
You'll probably never want to shut down this daemon, unless you are explicitly instructed to do so to debug a hardware problem.
Learn more:
http://www.acpi.info
anacron
One of the problems with living on a laptop, as so many of us do these days, is that when you set up a cron job to run, you can't always be sure that your laptop will be running at the time that the job should run. anacron (the name refers to its being an "anachronistic cron") gets around this problem by scheduling tasks in days. For example, anacron will run a job if the job has not been run in the specified number of days.
When are you safe not running anacron? When your system is running continuously. Should you simply stop cron from running if you have anacron running? No; anacron is able to specify job intervals in days, not hours and seconds.
Learn more:
http://anacron.sourceforge.net
apmd
This is the daemon for the Advanced Power Management (APM) BIOS driver. The APM hardware standard and apmd are being replaced by ACPI and acpid. If your hardware supports ACPI, then you don't need to run apmd.
atd
This is the daemon for the at job processor (at enables you to run tasks at specified times). You can turn off this daemon if you don't use it.
autofs
This daemon automatically mounts disks and file systems that you define in a configuration file. Using this daemon can be more convenient that explicitly mounting removable disks.
Learn more:
http://freshmeat.net/projects/autofs
Avahi-daemon and avahi-dnsconfd
The Avahi website defines Avahi as: 'a system which facilitates service discovery on a local network. This means that you can plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to, or find files being shared…' Avahi is a Zeroconf implementation. Zeroconf is an approach that enables users to create usable IP networks without having special configuration servers such as DNS servers.
A common use of the avahi-daemon is with Rhythmbox, so you can see music that is made available to be shared with others. If you're not sharing music or files on your system, you can turn off this daemon.
Learn more:
http://avahi.org
http://zeroconf.org
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