Shell Programming and Scripting

Hi there,

Hope the title is sufficiently self explaining.
I have no idea how to start and where to start.
I don't even know what keywords to google for.

I need to build a machine :
What program should I use to say :
I have to admit I know one keyword that I heard of and looks related to what I'm trying to do but it's to vast for me to narrow my google exploration. It's x11. Woohoo! Big start.



Can anyone point me even slightly in a more precise direction?



Thanks for your help.


Santiago

Programs like browsers rely heavily on some sort of desktop environment, like Gnome or KDE.

X11 is basically a library of graphic routines, not more. To make use of it, you need a window manager and more, which make up a desktop environment.

While it should be possible, to write programs which directly handle all the graphical output in fullscreen mode (like in the old DOS ages), programs like firefox won't work like this.

Or did I misunderstand you?

Thanks hergp.
I think you understood what I meant.
And I completely believe what you're saying.

My objection is that I administrate a network of 140+ video players that are no more than debian based mini-computers with two basics programs run on startup (via /etc/inittab). I have not created the system so I might miss some points but here is what I can see working.
An X window (or tell me how to call it) is launched via the command

Code:

/usr/bin/startx /etc/X11/my-session -- -br -ac -nolisten tcp

Mplayer is launched in this window with the commande

Code:

mplayer -slave -idle -quiet -vo x11 -loop 0 -fs -zoom -fixed-vo -input file=myfile

That's it. Then the system rolls smoothly in a store to entertain customers with fancy videos.

This looks extremely simple to me and I thought I could do close to the same thing with Firefox. Am I deliring?

Again hergp, I completely trust your answer, I'm just curious to understand a bit more the implications of what I'm talking about.

Regards
Santiago

I'm not sure what you're expecting firefox to do here.

You can run firefox and then what?

Hi Corona688,

Thanks for your interest.
Firefox will display a web page with charts that update every few minutes.
There's absolutely no input.

The 4 screens will display a different dashboards each.

Regards
Santiago

That sounds possible actually, but if Firefox encounters any sort of error, it will stop updating.

What you call a window is in fact a call to open an X session ( can contain multiple windows within e.g. a firefox window...) that means there is somewhere a X server running...
A X server can run different instances (sessions) the session number is what you see after IP or host name in the variable DISPLAY