# B.18 EchoPropertiesTask Displays all the current properties in the project. The output can be sent to a file if desired. This task can be used as a somewhat contrived means of returning data from an `<phing>` invocation, but is really for debugging build files. Table B.18:聽Attributes NameTypeDescriptionDefaultRequired`destfile``String`If specified, the value indicates the name of the file to send the output of the statement to. If not specified, then the output will go to the Phing log.n/ano`srcfile``String`If specified, the value indicates the name of the property file to read from. If not specified, then the system properties will be taken.n/ano`prefix``String`a prefix which is used to filter the properties only those properties starting with this prefix will be echoed.n/ano`regex``String`a regular expression which is used to filter the properties only those properties whose names match it will be echoed.n/ano`failonerror``Boolean`By default, the "failonerror" attribute is enabled. If an error occurs while writing the properties to a file, and this attribute is enabled, then a BuildException will be thrown, causing the build to fail. If disabled, then IO errors will be reported as a log statement, and the build will continue without failure from this task.n/ano`format``String`One of text or xml. Determines the output format. Defaults to text.n/ano B.18.1 Example `<echoproperties />`Report the current properties to the log. `<echoproperties destfile="my.properties"/>`Report the current properties to the file "my.properties", and will fail the build if the file could not be created or written to. `<echoproperties destfile="my.properties" failonerror="false"/>`Report the current properties to the file "my.properties", and will log a message if the file could not be created or written to, but will still allow the build to continue. `<echoproperties prefix="phing."/>`List all properties beginning with "phing." `<echoproperties regex="/.*phing.*/"/>`Lists all properties that contain "phing" in their names.