Eval111 » Historique » Révision 3
Révision 2 (François Rioult, 18/06/2010 21:35) → Révision 3/4 (François Rioult, 22/06/2010 22:49)
h1. Eval111
h2. Synopsis
This operator has one parameter, one input and one output. The corresponding shell script executes the parameter as a command on the input, and copies the result in the output.
h2. Parameters
1 parameter, treated as the command to be executed.
h2. Inputs
1 input, the input file
h2. Outputs
1 output: the result of the command
h2. Shell code
<pre>
cmd=$1; shift
input=$1; shift
output=$1; shift
$cmd $input > $output
</pre>
h2. Example
This operator is mainly used, for filtering a file with the parameter as command, or computing a result from the input and writing it to the output. See [[CMAR.aws]] for an example where this operator computes the predicted class for the column file of the votes.