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The command component is a required property of a task. The body of the command block specifies the literal command line to run (basically any command that you could otherwise run in a terminal shell) with placeholders (e.g. ${input_file}) for the variable parts of the command line that need to be filled in. Note that all variable placeholders MUST be defined in the task input definitions.

Usage example

command {
    java -jar myExecutable.jar \
        INPUT=${input_file} \
        OUTPUT=${output_basename}.txt
}