GNU/Linux Desktop Survival Guide by Graham Williams
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Managing Daemons or Services

In addition to managing the installed packages wajig also allows you to start, stop, reload, and restart services (which are often provided by so called daemons—processes that run on your computer in the background performing various functions on an on-going basis). The commands all follow the same pattern:

  $ wajig restart <service name>        (/etc/init.d/<service> restart)

The start and stop commands are obvious. The restart command generally performs a stop followed by a start. The reload command will ask the daemon to reload its configuration files generally without stopping the daemon, if this is possible. The services you can specifiy here depend on what you have installed. Common services include:

apache	Web server
cron	Regular task scheduler
exim	Email delivery system
gdm	The Gnome Windows Display Manager (for logging on)
ssh	The Secure Shell daemon

Generally, daemons are started at system boot time automatically.