what does daemon command do in linux

HI,
I came across the following command :
exec="mvn jetty:run -DFLOCK_APPS_CONFIG=${FLOCK_APPS_CONFIG} -DPORT=${PORT}"
daemon --user=$user $exec &

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what does it do ?
why to run a command using daemon ?

Thanks
Rohit BajajAsked:
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Kent WSr. Network / Systems AdminCommented:
In a nutshell, it runs Maven with embedded Jetty.
You would run as a daemon if you want it listening at all times, independent of CLI input.
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Carlos IjalbaSenior SysadminCommented:
a daemon on Linux and some UNIX is a job than runs in background as a server, basically is what in other operating systems is called:

windows  - a service
aix             - a subsystem
iSeries      - a server
linux         - a daemon

this kind of jobs can be setup to start and stop alogside the OS boot, so they can restart in case of failure, etc...
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Rohit BajajAuthor Commented:
Hi,
But when i run this script i dont see anything running
jetty doesnt run which ideally it should as the exec runs the jetty server
from inside the directory /opt/flock-snippets
I had put cd /opt/flock-snippets above the commands

doing ps -Af | grep jetty does not show anything running.
but if i dont use daemon it works
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