Linux Commands Examples

A great documentation place for Linux commands


Tool for working with D-Bus objects

see also : dbus-send


gdbus introspect [--system | --session | --address address] --dest bus_name --object-path /path/to/object [--xml] [--recurse] [--only-properties]

gdbus monitor [--system | --session | --address address] --dest bus_name [--object-path /path/to/object]

gdbus call [--system | --session | --address address] --dest bus_name --object-path /path/to/object --method org.project.InterfaceName.MethodName [--timeout seconds] ARG1 ARG2...

gdbus emit [--system | --session | --address address] --object-path /path/to/object --signal org.project.InterfaceName.SignalName [--dest unique_bus_name] ARG1 ARG2...

gdbus help

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This shows how to introspect an object - note that the value of each
property is displayed:

$ gdbus introspect --system \
--dest org.freedesktop.NetworkManager \
--object-path /org/freedesktop/NetworkManager/Devices/0
node /org/freedesktop/NetworkManager/Devices/0 {
interface org.freedesktop.DBus.Introspectable {
Introspect(out s data);
interface org.freedesktop.DBus.Properties {
Get(in s interface,
in s propname,
out v value);
Set(in s interface,
in s propname,
in v value);
GetAll(in s interface,
out a{sv} props);
interface org.freedesktop.NetworkManager.Device.Wired {
PropertiesChanged(a{sv} arg_0);
readonly b Carrier = false;
readonly u Speed = 0;
readonly s HwAddress = '00:1D:72:88:BE:97';
interface org.freedesktop.NetworkManager.Device {
StateChanged(u arg_0,
u arg_1,
u arg_2);
readonly u DeviceType = 1;
readonly b Managed = true;
readwrite o Ip6Config = '/';
readwrite o Dhcp4Config = '/';
readwrite o Ip4Config = '/';
readonly u State = 2;
readwrite u Ip4Address = 0;
readonly u Capabilities = 3;
readonly s Driver = 'e1000e';
readwrite s Interface = 'eth0';
readonly s Udi = '/sys/devices/pci0000:00/0000:00:19.0/net/eth0';

The --recurse and --only-properties options can be useful when wanting to inspect all objects owned by a particular process:

$ gdbus introspect --system --dest org.freedesktop.UPower --object-path / --recurse --only-properties
node / {
node /org {
node /org/freedesktop {
node /org/freedesktop/UPower {
interface org.freedesktop.UPower {
readonly b IsDocked = true;
readonly b LidForceSleep = false;
readonly b LidIsPresent = false;
readonly b LidIsClosed = false;
readonly b OnLowBattery = false;
readonly b OnBattery = false;
readonly b CanHibernate = true;
readonly b CanSuspend = true;
readonly s DaemonVersion = '0.9.10';
node /org/freedesktop/UPower/Policy {
node /org/freedesktop/UPower/Wakeups {
interface org.freedesktop.UPower.Wakeups {
readonly b HasCapability = true;

In a similar fashion, the introspect command can be used to learn details about the Notify method:

interface org.freedesktop.Notifications {
GetServerInformation(out s return_name,
out s return_vendor,
out s return_version,
out s return_spec_version);
GetCapabilities(out as return_caps);
CloseNotification(in u id);
Notify(in s app_name,
in u id,
in s icon,
in s summary,
in s body,
in as actions,
in a{sv} hints,
in i timeout,
out u return_id);

With this information, it's easy to use the call command to display a notification

$ gdbus call --session \
--dest org.freedesktop.Notifications \
--object-path /org/freedesktop/Notifications \
--method org.freedesktop.Notifications.Notify \
my_app_name \
42 \
gtk-dialog-info \
"The Summary" \
"Here's the body of the notification" \
[] \
{} \
(uint32 12,)

Monitoring all objects on a service:

$ gdbus monitor --system --dest org.freedesktop.ConsoleKit
Monitoring signals from all objects owned by org.freedesktop.ConsoleKit
The name org.freedesktop.ConsoleKit is owned by :1.15
/org/freedesktop/ConsoleKit/Session2: org.freedesktop.ConsoleKit.Session.ActiveChanged (false,)
/org/freedesktop/ConsoleKit/Seat1: org.freedesktop.ConsoleKit.Seat.ActiveSessionChanged ('',)
/org/freedesktop/ConsoleKit/Session2: org.freedesktop.ConsoleKit.Session.ActiveChanged (true,)
/org/freedesktop/ConsoleKit/Seat1: org.freedesktop.ConsoleKit.Seat.ActiveSessionChanged ('/org/freedesktop/ConsoleKit/Session2',)

Monitoring a single object on a service:

$ gdbus monitor --system --dest org.freedesktop.NetworkManager --object-path /org/freedesktop/NetworkManager/AccessPoint/4141
Monitoring signals on object /org/freedesktop/NetworkManager/AccessPoint/4141 owned by org.freedesktop.NetworkManager
The name org.freedesktop.NetworkManager is owned by :1.5
/org/freedesktop/NetworkManager/AccessPoint/4141: org.freedesktop.NetworkManager.AccessPoint.PropertiesChanged ({'Strength': <byte 0x5c>},)
/org/freedesktop/NetworkManager/AccessPoint/4141: org.freedesktop.NetworkManager.AccessPoint.PropertiesChanged ({'Strength': <byte 0x64>},)
/org/freedesktop/NetworkManager/AccessPoint/4141: org.freedesktop.NetworkManager.AccessPoint.PropertiesChanged ({'Strength': <byte 0x5e>},)
/org/freedesktop/NetworkManager/AccessPoint/4141: org.freedesktop.NetworkManager.AccessPoint.PropertiesChanged ({'Strength': <byte 0x64>},)

Emitting a signal:

$ gdbus emit --session --object-path /foo --signal "['foo', 'bar', 'baz']"

Emitting a signal to a specific process:

$ gdbus emit --session --object-path /bar --signal someString --dest :1.42


gdbus is a simple tool for working with D-Bus objects.

bash completion

gdbus ships with a bash completion script to complete commands, destinations, bus names, object paths and interface/method names.



Prints out interfaces and property values for a remote object. For this to work, the owner of the object needs to implement the org.freedesktop.DBus.Introspectable interface. If the --xml option is used, the returned introspection XML is printed, otherwise a parsed pretty representation is printed. The --recurse option can be used to introspect children (and their children and so on) and the --only-properties option can be used to only print the interfaces with properties.


Monitors one or all objects owned by the owner of bus_name.


Invokes a method on a remote object. Each argument to pass to the method must be specified as a serialized GVariant except that strings do not need explicit quotes. The return values are printed out as serialized GVariant values.


Emits a signal. Each argument to include in the signal must be specified as a serialized GVariant except that strings do not need explicit quotes.


Prints help and exit.


Please send bug reports to either the distribution bug tracker or the upstream bug tracker at

see also


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