Terminal command for closing program

Question

I'm used to quickly closing windows on i3wm and SwayWM, where I would just press WIN+SHIFT+Q. I've already checked and there are no alternatives for elementary OS except ALT+F4, which is annoying since I have to press FN as well.

What is the terminal command ALT+F4 uses to close the currently highlighted window? I want to use that command in the Custom section of the Keyboard settings.

Answer 1

I've already checked and there are no alternatives for elementary OS except ALT+F4

Well that is the "alternative" if I see it from your point of view. But like KDE, GNOME and many others yours is the real alternative and a rarity of a non spoken rule to define ALT+F4 as a way to close active windows

In elementary OS's Pantheon we call it shortcut, you may keep calling it alternative

If I start to think where it came the idea of this shortcut (or alternative), I'll probably will have to go back to the 80's where a lot of Common User Access standards were written/defined and then Microsoft thought to use F4 better than Q in case a non English speaker will use the shortcut (associated with Quit) or a DVORAK layout user who will not have the Q up there

Also you could check System reserved shortcuts for GNOME in https://developer.gnome.org/hig/stable/keyboard-input.html.en

And for KDE you'll find them in https://docs.kde.org/trunk5/en/applications/fundamentals/kbd.html

All of them using the "alternative"

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I understand you want something like XF86Close, a simple command. But doesn't work when I tested it.

SOLUTION 1:

In terms of kill the current active window, isn't simple to achieve but you could do it by binding

"xkill -id $(xprop -root | grep NET_ACTIVE_WINDOW\( | cut -d# -f2)"

, to a key

ref: https://bbs.archlinux.org/viewtopic.php?pid=897968#p897968

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SOLUTION 2:

$ xdotool key Alt+F4

To install it: sudo apt install xdotool

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SOLUTION 3:

$ wmctrl -c :ACTIVE:

To install it: sudo apt install wmctrl

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SOLUTION 4:

You could play with xev

Check the outputs and remap it (/usr/share/X11/xkb/keycodes/evdev)

My ALT+F4 from xev:

KeyPress event, serial 38, synthetic NO, window 0x4a00001,
    root 0x6c6, subw 0x0, time 1732231, (-131,275), root:(500,652),
    state 0x10, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

FocusOut event, serial 38, synthetic NO, window 0x4a00001,
    mode NotifyGrab, detail NotifyAncestor

ClientMessage event, serial 38, synthetic YES, window 0x4a00001,
    message_type 0x132 (WM_PROTOCOLS), format 32, message 0x130 (WM_DELETE_WINDOW)

More info about map them and the use of xkb

https://medium.com/@damko/a-simple-humble-but-comprehensive-guide-to-xkb-for-linux-6f1ad5e13450

https://askubuntu.com/a/347382/890782