Stop/kill a process from the command line after a certain amount of time

Question

I have a component with the following template (...component.html):

<canvas></canvas>

Furthermore I have in ...component.ts:

export class TestComponent implements AfterViewInit {

  @ViewChild('canvas')
  private canvasRef: ElementRef;

How can I now calculate the to the window border as marked in the picture below (see red lines)?

For jQuery users: I'm looking for a way to calculate $("#desiredCanvasElement").position();

Solution

The simplest solution would be to use timeout from the collection of GNU coreutils (probably installed by default on most Linux systems):

timeout 10 ./sopare.py -l

See the manual for this utility for further options (man timeout). On non-GNU systems, this utility may be installed as gtimeout if GNU coreutils is installed at all.

Another alternative, if GNU coreutils is not available, is to start the process in the background and wait for 10 seconds before sending it a termination signal:

./sopare.py -l &
sleep 10
kill "$!"

$! will be the process ID of the most recently started background process, in this case of your Python script.

In case the waiting time is used for other things:

./sopare.py -l & pid=$!
# whatever code here, as long as it doesn't change the pid variable
kill "$pid"

Comments

[enno.void]

stackoverflow.com/questions/10564680/…

[d4rty]

@mr.void using jQuery is fine for me. Just don't know how to use the canvasRef property together with jQuery

[enno.void]

just do $(canvasRef) , ensure jquery is loaded

[d4rty]

just $(canvasRef) leads to an error, $(this.canvasRef.nativeElement) works!

[Stephen Boston]

Does this help serverfault.com/questions/205498/…

[Haxiel]

Since you want to end the program after a specified amount of time, you can look at timeout : ss64.com/bash/timeout.html

[d4rty]

This doesn't work, since the padding is part of the element itself (as you use it in your fiddle). If you change padding to margin (which is an example for my usecase) your solution doesn't work.

[Pezetter]

Fair enough, but the same methodology should work, no?

[Kusalananda]

You don't start anything in the background. If you did (using &), the PID of that process would be available in "$!".

[Z E Nir]

I thought "$!" will return the PID of the invoking script... good to learn new things. Thanks! (btw i didn't try it with python, but my script is working with a while(1) C program) Also in your solution, you must consider 10 seconds is a lot of time and maybe $! value is no longer what you wanted...

[Kusalananda]

You have $$ which would be the PID of the current script. Is that what you're thinking of?