Refreshing a status bar with a shell script

Hello,
I use the lemonbar to display some informations about my system. The lemonbar
use a shell script to display informations. Sometimes I want to refresh my status bar.
To be brief: is it possible to refresh the status bar without checking for example every 2 seconds with
a "sleep 2" command ?
Let's take an example: with my window manager I switch
from desktop 1 to desktop 2. At the moment I use a sleep command and I refresh the information
every 2 seconds. Is there a way my shell script get notified about the switch from desktop 1 to desktop 2 and can refresh
the information in my status bar ? So it would be not necessary to execute a sleep command every two seconds.
Until now I found nothing. An idea is to react to a keyboard shortcut (the switch from desktop 1 to desktop 2), but
I don't know if it's possible. Perhaps something with a signal ? I also know some X events are generated by creating or closing windows
for example. I don't know if reacting to X events would be another possibility.
Thank you!

kokoko3k wrote:Eg: if a WM writes the current desktop in a file, then you can just watch that file via inotify and do an event driven action.
I will keep it in mind. I have to check, but it's possible I can use that solution.
kokoko3k wrote:As a side note: how do you switch "desktops" without a WM? Was it just an example?
Yes, it was an example. If I change in the future I could use the solution for the chosen wm.
But at the moment I can create groups. Each groups get a number and I can raise or hide all applications
in that group. So it's the same problem.

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Message was edited by: joshz
Message was edited by: joshz
Message was edited by: joshz
Message was edited by: joshz

joshz wrote:
A few q's.
1. you have "n=$#", but never use n. What is that for?
Er... because I originally did it differently and then forgot to go back and delete this line!
2. Why do you set list to a blank string? Just to initialize it?
Yes. Habit. Sometimes it is an error to use an unassigned variable. It would not matter in this case because echo will not complain, but it still appeals to my sense of logic/tidiness. It also means that if I later change something in my script so that an unassigned variable will cause an error, I won't be stymied by a failure I can't explain. (Not really an issue in a script this short but might well be in a longer script.)
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>
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SQL*Plus: Release 11.2.0.1.0 Production on Fri Jul 20 15:14:15 2012
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Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Refreshing a status bar with a shell script

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