Ash script to force-run a browser

DragonM15 · 01-16-2009, 02:46 PM

I recently got a Nokia N810, which comes with a linux variant. I am looking to make a script that once the device is fully booted it will start the browser (conveniently named browser). The device comes preinstalled with an ash terminal.

So heres what I need:

A script written in ash that will check to see if the browser is open, if it is, then dont do anything, but if it isnt, then start it. Is there a way to make this run continuously? So if the browser is stopped it will immediately be brought back up? Unless of course the device is powering down.

Thanks

Disillusionist · 01-16-2009, 03:45 PM

Does the device support cron for scheduling?

As far as the script is concerned...
I would use ps -ef to display all running processes
and grep br[o]wser to get just the entries that I was after
and use wc -l to count the number of entries returned.

Then it's just a case of running a test on the number of records and if -eq 0 then run browser & (in background:

Code:

#!/bin/ash
if [ $(ps -ef|grep br[o]wser|wc -l) -eq 0 ]
then
   browser &
fi

You might want to modify it a bit, but check the general process first, aditionally, you might want to run type browser from the command line to get the full path (as the PATH environment variable isn't always the same if run through cron)

Good luck.

DragonM15 · 01-16-2009, 05:58 PM

Quote:

Originally Posted by Disillusionist

Does the device support cron for scheduling?

As far as the script is concerned...
I would use ps -ef to display all running processes
and grep br[o]wser to get just the entries that I was after
and use wc -l to count the number of entries returned.

Then it's just a case of running a test on the number of records and if -eq 0 then run browser & (in background:

Code:

#!/bin/ash
if [ $(ps -ef|grep br[o]wser|wc -l) -eq 0 ]
then
   browser &
fi

You might want to modify it a bit, but check the general process first, aditionally, you might want to run type browser from the command line to get the full path (as the PATH environment variable isn't always the same if run through cron)

Good luck.

I understand everything that you put into that script, except, why did you put brackets around the o in browser?

Thanks

Disillusionist · 01-17-2009, 05:04 AM

The brackets around the o in browser is to prevent you from needing to type grep -v grep as the grep statement doesn't meet its search criteria.

It's something I've been doing for ages

unSpawn · 01-17-2009, 06:19 AM

Quote:

Originally Posted by Disillusionist

The brackets around the o in browser is to prevent you from needing to type grep -v grep as the grep statement doesn't meet its search criteria.

It's something I've been doing for ages

...then you might be interested to know there's pgrep. Way more efficient.