KRunner

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KDE
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Help:Style
for reference.
Reason:
Need to add permission information. (Discuss in
Talk:KRunner
)
KRunner
is an application built into KDE
Plasma
to perform functions and run commands quickly, and features a "runner" system to customize functions available for use.
Installation
Install
the
krunner
package.
Usage
To open KRunner in Plasma, you can either right-click the desktop and press "run command", or you can use the default keybindings,
Alt+Space
or
Alt+F2
. In some workspaces such as a blank desktop, starting to type will automatically bring up KRunner.
Open KRunner with the Meta key
KRunner can now be bound to the Meta key directly in
System Settings > Shortcuts > Krunner
.
Change position where KRunner is displayed
By default KRunner is displayed at top of screen. To make it appear centered, run
$ kwriteconfig6 --file krunnerrc --group General --key FreeFloating true
The change will become effective on next login.
Switch active windows
The factual accuracy of this article or section is disputed.
Reason:
Disabling plugins will also affect search in the application launcher (
Alt+F1
) and the overview mode (
Meta+W
), which is probably not what users want. If there is no way do disable plugins just for KRunner, the xdotool method may still be preferable (but it obviously does not work in Wayland). (Discuss in
Talk:KRunner#Possible ideas for expansion
)
In Krunner configuration, there is a plug-in configuration button where you can choose needed search source. See
the user manual
for detail.
If you want to specify krunner search only by active window titles, just enable window plugin and disable the others.
Full list of windows with search by titles
This approach will require
xdotool
.
Go to
System Settings > Workspace > Shortcuts > Custom Shortcuts
.
Create new Global shortcut -> Command/URL (by right click)
Tick the checkbox to the right of the name.
In Trigger tab select the desired key combination.
In Action tab type
/usr/local/bin/krunner-search-by-windows.sh
Create
file
/usr/local/bin/krunner-search-by-windows.sh
with the following content:
#!/bin/bash
qdbus org.kde.krunner /App querySingleRunner windows "" 
sleep 0.2
xdotool key "ctrl+A"
xdotool type 'window '
xdotool key "shift+BackSpace"
Make file
executable
and give run permission to all.
Note the space after
window
.
It is possible to specify the search query directly, but repeated search queries will be selected. To avoid this, use a state file to add a space in front of
window
.
#!/bin/bash

if [ -e state_file ]; then
    qdbus org.kde.krunner /App querySingleRunner windows "windows "
    rm state_file
else
    qdbus org.kde.krunner /App querySingleRunner windows " windows "
    touch state_file
fi
Now you are able to get list of opened windows by specified shortcut and search by this list as you type;
Search by titles without full windows list
This approach is more limited but far less ugly.
Go to
System Settings > Workspace > Shortcuts > Custom Shortcuts
.
Create new Global shortcut -> D-bus Command (by right click)
Tick the checkbox to the right of the name
In Trigger tab select the desired key combination
In Action tab insert the following:
- Remote application : org.kde.krunner
 - Remote Object      : /App
 - Function           : querySingleRunner
 - Arguments          : windows ""
See also
KRunner on KDE UserBase Wiki