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/usr/share/dx/samples/scripts/Echo is in dxsamples 4.2.0-1.

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    // Import a field
electrondensity = Import("watermolecule");
    // Partition the data
electrondensity = Partition(electrondensity);
    // Compute the gradient of the data
gradientdensity = Gradient(electrondensity);
    // compute the divergence and curl of the gradient field
divergence, curl = DivCurl(gradientdensity);
    // Find the statistics of the divergence
mean,sd,var,min,max = Statistics(divergence);
    // Create an echo string listing the statistics
Echo("divergence field:  mean=",mean,"sd=",sd,"min=",min,"max=",max);