Concepts and Types - TypesI/O RedirectorsI/O redirectionFor many tasks, input and output can be defined in a fairlystraightforward fashion. The exectask, used to execute an external process, stands as a verybasic example. The executed process may accept input, produceoutput, or do either or both depending upon various circumstances.Output may be classified as "output" or as "erroroutput." The <redirector> type provides a concrete meansof redirecting input and output featuring the use ofFile Mappers to specifysource (input) and destination (output/error) files. Since Apache Ant 1.6.2 The <redirector> element accepts the following attributes: | Attribute | Description | Required | | output | Name of a file to which output should be written. If the error stream is not also redirected to a file or property, it will appear in this output. | No | | error | The file to which the standard error of the command should be redirected. | No | | logError | This attribute is used when you wish to see error output in Ant's log and you are redirecting output to a file/property. The error output will not be included in the output file/property. If you redirect error with the error or errorProperty attributes, this will have no effect. | No | | append | Whether output and error files should be appended to rather than overwritten. Defaults to false. | No | | createemptyfiles | Whether output and error files should be created even when empty. Defaults to true. | No | | outputproperty | The name of a property in which the output of the command should be stored. Unless the error stream is redirected to a separate file or stream, this property will include the error output. | No | | errorproperty | The name of a property in which the standard error of the command should be stored. | No | | input | A file from which the executed command's standard input is taken. This attribute is mutually exclusive with the inputstring attribute. | No | | inputstring | A string which serves as the input stream for the executed command. This attribute is mutually exclusive with the input attribute. | No | | inputencoding | The input encoding. | No | | outputencoding | The output encoding. | No | | errorencoding | The error encoding. | No | | alwayslog | Always send to the log in addition to any other destination. Since Ant 1.6.3. | No, default is false | | loginputstring | Controls the display of inputstring's value in log messages. Set to false when sending sensitive data (e.g. passwords) to external processes. Since Ant 1.6.3. | No, default is true | Parameters specified as nested elementsinputmapperA single File Mapper used to redirect processinput. Multiple mapping results should concatenate all mapped files as input.Mapping will ordinarily be performed on a task-specified sourcefile;consult the documentation of the individual task for more details.A nested <inputmapper> is not compatible with either of theinput or inputstring attributes. outputmapperA single File Mapper used to redirect processoutput. Mapping will ordinarily be performed on a task-specified sourcefile;consult the documentation of the individual task for more details.A nested <outputmapper> is not compatible with theoutput attribute. errormapperA single File Mapper used to redirect erroroutput. Mapping will ordinarily be performed on a task-specified sourcefile;consult the documentation of the individual task for more details.A nested <errormapper> is not compatible with theerror attribute. inputfilterchainA FilterChain can beapplied to the process input. outputfilterchainA FilterChain can beapplied to the process output. errorfilterchainA FilterChain can beapplied to the error output. UsageTasks known to support I/O redirection:The expected behavior of a <redirector> is to a great degreedependent on the supporting task. Any possible points of confusionshould be noted at the task level. | 
