systemd A monkey with a typewriter Zbigniew Jędrzejewski-Szmek zbyszek@in.waw.pl busctl 1 busctl Introspect the bus busctl OPTIONS COMMAND NAME busctl may be used to introspect and monitor the D-Bus bus. The following options are understood: --address=ADDRESS Connect to the bus specified by ADDRESS instead of using suitable defaults for either the system or user bus (see --system and --user options). --show-machine When showing the list of endpoints, show a column containing the names of containers they belong to. See systemd-machined.service8. --unique When showing the list of endpoints, show only "unique" names (of the form :number.number). --acquired The opposite of --unique — only "well-known" names will be shown. --activatable When showing the list of endpoints, show only endpoints which have actually not been activated yet, but may be started automatically if accessed. --match=MATCH When showing messages being exchanged, show only the subset matching MATCH. --no-legend Do not print the legend, i.e. the column headers and the footer. --size= When used with the capture command specifies the maximum bus message size to capture ("snaplen"). Defaults to 4096 bytes. --list When used with the tree command shows a flat list of object paths instead of a tree. --quiet When used with the call command suppresses display of the response message. The following commands are understood: list Show service names on the bus. This is the default if no command is specified. status SERVICE Show process information and credentials of a bus service. monitor SERVICE Dump messages being exchanged. If SERVICE is specified, show messages to or from this endpoint. Otherwise, show all messages on the bus. Use Ctrl-C to terminate dump. capture SERVICE Similar to monitor but writes the output in pcap format (for details see the Libpcap File Format description. Make sure to redirect the output to STDOUT to a file. Tools like wireshark1 may be used to dissect and view the generated files. tree SERVICE Shows an object tree of one or more services. If SERVICE is specified, show object tree of the specified services only. Otherwise, show all object trees of all services on the bus that acquired at least one well-known name. introspect SERVICE OBJECT Show interfaces, methods, properties and signals of the specified object (identified by its path) on the specified service. call SERVICE OBJECT INTERFACE METHOD SIGNATURE ARGUMENT Invoke a method and show the response. Takes a service name, object path, interface name and method name. If parameters shall be passed to the method call a signature string is required, followed by the individual arguments, individually formatted as textual parameters. get-property SERVICE OBJECT INTERFACE PROPERTY Retrieve the current value one or more object properties. Takes a service name and object path. Optionally takes an interface name and property name. If the property name is omited, shows all properties on the selected interface. If the interface is also omitted shows the properties of all interfaces. Multiple properties may be specified at once in which case their values will be shown one after the other. help Show command syntax help. dbus-daemon1, D-Bus, kdbus, sd-bus3, systemd1, systemd-bus-proxyd8, machinectl1, wireshark1