Eval101¶

Synopsis¶

This operator has only one parameter and no input. The corresponding shell script executes the parameter as a command, and copies the result in the output.

Parameters¶

1 parameter, treated as the command to be executed. The command can contains spaces, such as ls -al, date -R.

Inputs¶

No input

Outputs¶

1 output: the result of the command

Shell code¶

cmd=$1; shift
output=$1; shift

$cmd > $output

Example¶

This operator can be used for generating a file, containing the current date for example, with "date" as a parameter.

See the scenario Perturbation with RapidMiner, where this operator initiates an "empty" file with only the date for a "for" loop.