Eval201 » Historique » Révision 3
Révision 2 (François Rioult, 18/06/2010 21:15) → Révision 3/4 (François Rioult, 18/06/2010 22:42)
h1. Eval201
h2. Synopsis
This operator has two parameters and no input. The corresponding shell script executes the two parameters as a command, and copies the result in the output.
It is useful for commands with arguments, such as @awk@ commands whose arguments include space, quotes, etc., that could not be written with only one parameter in [[eval101]]. It can also produce file with commands using the parameters given by Ariane.
h2. Parameters
2 parameters, treated as the command to be executed.
h2. Inputs
No input
h2. Outputs
1 output: the result of the command
h2. Example
This operator can be used for generating a file with an @awk@ instruction, for example:
<pre>
awk '{for(i=1;i<=10;i++)printf("train.%d", i)} input > output
</pre>
See the scenario [[perturbation.aws]], [[missing.aws]], where this operator uses @echo@ for saving a parameter in a file.