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.