---
name: "kded4"
section: "8"
platform: "linux"
package: "kdelibs-bin"
version: "4:4.14.38-3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/kded4"
---

# kded4(8)

KDE daemon - triggers Sycoca database updates when needed.

## NAME

kded4 - KDE daemon - triggers Sycoca database updates when needed.

## SYNOPSIS

**kded4** \[--help\] \[Generic options\] \[Qt-options\] \[KDE-options\] \[--check\]

## DESCRIPTION

**kded4** is responsible for creating the sycoca file, i.e. the binary cache of servicetypes, mimetypes, and services for a particular user.

It monitors the directories containing .desktop files. When a file is added/removed, it waits 5 seconds (in case of a series of updates), and then launches **kbuildsycoca4** to update the sycoca.

It checks newly installed update files, i.e. the \*.upd files used to update configuration files of users when the configuration file formats changes. **kconf\_update** is launched to do the updates.

When the hostname changes, it will make the necessary changes to the KDE environment and X-server to allow continued proper operation, launching **kdontchangethehostname** to do the changes.

Those tasks are also performed always at kded4 start to ensure that the user configuration is up to date.

It is also responsible for launching the on-demand kded4 modules and init enabled kded4 modules like:

**Konqueror Browser Preloader**

Reduces Konqueror startup time.

**Directory Watcher**

Monitors directories for changes.

**Hardware Detection**

Provides a user interface for hardware events.

**SSL Certificate Policy**

Provides the user configured SSL certificate policy to applications.

**Network Proxy Configuration**

Automatic proxy configuration.

**Password Caching**

Temporary password caching, for example: so that a webpage with HTTP authentication doesn't ask for your password for every link and every image in the page. These passwords are forgotten when exiting KDE (unlike **KWallet**)

**Sound Policy**

Provides the sound system policy to applications.

**Favicons**

Stores website icons.

**Display Management**

Manages displays and video outputs.

**Cookie jar**

Stores network cookies.

**Network Watcher**

Keeps track of the network and updates directory listings of the network:/ KIO slave.

**Subversion Module**

Provides various subversion actions to filemanager and other software.

**Network Status**

Tracks status of network interfaces and provides notifications for applications using the network.

**Write Daemon**

Watches the messages from local users sent with [*write*(1)](/write/1.md) or [*wall*(1)](/wall/1.md).

**Notification area watcher**

Keeps track of applications that want to use the D-Bus based notification area.

**KMixD**

KMixD Mixer Service

**Systemtray daemon**

Keeps track of applications that want to use the D-Bus based system tray.

**Keyboard Daemon**

Keeps track of keyboard changes (new keyboard, changed layout)

**Remote URL Change Notifier**

Provides change notifications for network folders

**Activity Manager**

The Nepomuk activities manager backend

**Display Management change monitor**

Notifies how the display has been rotated (where available)

**Free Space Notifier**

Warns when running out of space in your home folder.

**Removable Device Automounter**

Automatically mounts devices as needed.

**Nepomuk Search Module**

Helper module for KIO to ensure automatic updates of Nepomuk search listings.

**Power Management**

Battery, Display and CPU power management and notifications.

**K Remote Control Daemon**

Manages the Remote Control commands received

**Status Notifier Manager**

Manages services that provide status notifier user interfaces.

**DNS-SD Service Discovery Monitor**

Monitors the network for DNS-SD services.

**Drive Ejector**

Automatically unmounts and releases drives when their eject button is pushed.

**Time zone**

Provides access to the system's time zones for applications.

**Input Actions**

Input Actions service performing configured actions on key presses.

The init modules can be enabled/disabled using **systemsettings**, in System Administration \> Startup and Shutdown \> Service Manager.

## GENERIC OPTIONS

- **--author**

  Show author information.

- **--help**

  Show help about options.

- **--help-all**

  Show all options.

- **--help-kde**

  Show KDE specific options.

- **--help-qt**

  Show Qt specific options.

- **--license**

  Show license information.

- **-v** **--version**

  Show version information

## APPLICATION OPTIONS

- **--check**

  Check Sycoca database only once.

## USAGE

If **kded4** is called without parameters and is already running, it shows the message:

```
KDE Daemon (kded) already running.
```

If **kded4** is called with **kded4 --check**, then it updates the KDE sycoca using **kbuildsycoca4**.

## SEE ALSO

[*kdeoptions*(7)](/kdeoptions/7.md), [*qtoptions*(7)](/qtoptions/7.md), [*kbuildsycoca4*(8)](/kbuildsycoca4/8.md)

## BUGS

There are probably tons of bugs. Use **bugs.kde.org**\[1\] to report them.

## AUTHORS

**David Faure** \<faure@kde.org\>

Author.

**Waldo Bastian** \<bastian@kde.org\>

Author.

## NOTES

- 1\.

  bugs.kde.org

  http://bugs.kde.org