python run a constant subprocess in background

You can use dconf watch / to see what settings are being changed, but not how it's done. Read the source code of application, if it is possible to obtain it. If you want to see which command is issued in that app's programming language as you press a button or click on window elements, then it's not possible. How to have a peep at the internal working of these applications? I mean, is there any way of actually looking at the commands that are being executed at every click of button? There I have written a function to create an instance of the Gio.Settings class and then use it to modify the Unity launcher depending on the type of list you want to have there. To give you a sample of how it's done with libraries/modules, feel free to take a look at the source code of my launcher list indicator. So to answer your title question: 'Do GUI based application execute shell commands in the background?' They can, but likely it's not necessary because there's a library for whatever language that app is written in, and likely it's gonna be a bit faster to use a library function, than spawning a new process. A C program will use something similar, likely a gio.h library, or it could even use the exec() family of functions to do the same as Popen does in python. Programs written in Python will likely use the gi.repository.Gio module (I know because I use it a lot) or they can instead use gsettings as an external command by calling subprocess.Popen(), and it will basically run as a shell command. They write to the dconf database of settings, but they could be using different ways to do so. So, in short, is doing things using GUI applications same as doing stuff from the commandline?ĭo these GUI-based applications also execute the same command in the background? Moreover, the strace -p pid -o output.txt command throws a huge amount of text into the file. The answer here tells how to get the process's standard file descriptor. Do these applications open up a terminal in the background and execute these commands?.

How to have a peep at the internal working of these applications? I mean, is there any way of actually looking at the commands that are being executed at every click of button?.Do these GUI-based applications also execute the same command in the background?.But these are the GUI approach of getting things done. On Googling, I found a command which goes like: gsettings set launcher-position BottomĪlso, there are the unity-tweak-tool and dconf editor to get the job done. Just like in Windows, I wanted the launcher to be at the bottom of the screen. I am just playing around with the look and feel of the Desktop environment. I like the way we can customise the Unity Desktop. I have migrated to Ubuntu 16.04 just 2 days ago from Windows.

Python run a constant subprocess in background