Echo Task

## Echo

### Description

Echoes a message to the current loggers and listeners which means `System.out` unless overridden. A `level` can be specified, which controls at what logging level the message is filtered at.

The task can also echo to a file, in which case the option to append rather than overwrite the file is available, and the `level` option is ignored

### Parameters

Attribute | Description | Required
message | the message to echo. | Yes, unless data is included in a character section within this element.
file | the file to write the message to. | No
append | Append to an existing file? | No - default is false.
level | Control the level at which this message is reported. One of "error", "warning", "info", "verbose", "debug" | No - default is "warning".

### Examples

      <echo message="Hello, world"/>

    <echo>This is a longer message stretching over
    two lines.
    </echo>

    <echo>
    This is a longer message stretching over
    three lines; the first line is a blank
    </echo>

As XML parsers are wont to do, the first newline in the text element has been included in the text.

    <echo message="Deleting drive C:" level="debug"/>

A message which only appears in `-debug` mode.

    <echo level="error">
    Imminent failure in the antimatter containment facility.
    Please withdraw to safe location at least 50km away.
    </echo>

A message which appears even in `-quiet` mode.

    <echo file="runner.csh" append="false">#\!/bin/tcsh
    java-1.3.1 -mx1024m ${project.entrypoint} $$*

Generate a shell script by echoing to a file. Note the use of a double $ symbol to stop Ant filtering out the single $ during variable expansion

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