Read from process

Bob Sneidar bobs at
Wed Mar 28 18:08:20 EDT 2012

One method I have heard of is to redirect output to a text file, then open the file for read and read from the file every so often in a repeat loop. You still need to know when the process has ended so you can break out of the loop. 


On Mar 28, 2012, at 2:39 PM, Glen Bojsza wrote:

> The documentation seems slightly confusing (to me).
> On Linux I want to open a process for update, then write the command to be
> executed and then read from the process and fill the output to a field.
> The command takes anywhere from 1 minute to 8 minutes to execute and while
> it is running it outputs the various stages and results it currently has
> completed.
> In the terminal window if I just do the command line it produces anywhere
> between 20 to 100 lines of output where the final line has a unique output
> acknowledging that it has completed.
> How should I be writing my read from process?
> I assume that this should be done inside a repeat forever loop where you
> can trap the mouseclick to exit or check for the unique output line from
> the read process to exit.
> I can't seem to any output from the read statement?
> Finally, is there a way to make this non blocking (ie let it run and update
> the field while the user moves on to something else)?
> thanks,
> Glen
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