When I run xkill in terminal a X (cross sign) appears which seems to kill that GUI process (application) on which it is hovered and clicked. I expect the same behavior for GNOME Terminal (since in my understanding it is also a GUI application). But I get different behaviors under different display manager.
Under x11:
Under Wayland:
It seems xkill can't kill terminal in Wayland.
I am curious if the Alt + F2 xkill command has been replaced by something similar, or if it has been removed entirely.
I know we can use other methods to stop processes, I'm just curious.
After upgrading to Ubuntu 18.04, I can't find xkill on pressing Alt+F2. Instead it shows a message box with a text-field titled as Enter a Command.
How can I find xkill on Ubuntu 18.04 and what is the purpose of this new window?
I found xkill on dashboard and my pointer turned into an "x" sign on clicking it. It doesn't change back when I press Esc.
What does this "x" sign stand for and what does it do?
Question
Do you know any tool/script to send SIGSTOP (to pause a process) or SIGCONT (to resume it) to a process by clicking on a graphical window generated by the process?
Some context
There is already a tool called xkill which kills programs by clicking on a window, but it has no options to send a particular signal. This is a pity, because somewhat related command-line tools like kill have this option.
Usually I do this via command line by manually obtaining the corresponding process names and using tools like kill, pkill or killall but it would be nice to be able to do this graphically, in a way similar to clicking on a window with the xkill tool.
Applications
I would find such a tool very useful to graphically pause some heavy processes when the CPU is too "stressed" without terminating them and without losing data which cannot be saved (e.g. for partial results of long calculations).