[PD] Using commands to launch ffplay or vlc with the "system" external, and daemon at

[tep]

Hi,

I need to launch either ffplay or vlc by sending messages to the "system"
external. I know almost nothing about the commands in linux, but i was told
that it's required to use the "at" daemon, and also echo.
Did try several things but nothing works as i don't know the syntax.
I thought it would be something like :

echo vlc /home/user/Desktop/alea.mpg | at now

but it just doesn't make anything .... while it works with, let's say, the
clocK
Is there a special character i need to add ?

Sorry for the simple question.

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