The data_well command also provides I/O redirection. It reads from a sink, and writes to standard output, i.e., to a pipe. Each data_well instance will read only from its designated location in the sink file, based on the ID it is passed as a command line argument.

Hence data_well is called with two arguments, the sink file name, and the sink ID, which is a number between 0 and nr_sinks - 1 inclusive. Its output will be provided through a pipe.

data_well  -id ${id}  -sink_file data.sink | some_other_program 

Optionally, data_well can produce feedback useful for tuning and/or debugging. The -verbose flag allows to set the level of information printed to standard error. For level 0 there is no feedback, level ` provides run time information, higher levels may be added in future.

Help on the avaible command line options for this command can be obtained using the -? flag.