What is more portable? echo -e or using printf?
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I'm currently writing a bash testing framework, which requires to be as portable as possible.

So, at one point, I had to print a leading newline followed by some text which contains several expanded variables. This is the solution I've used.

    echo -e "\n$number_of_specs ${units}, $number_of_specs_failed failed"

This seems okay but I'm not sure how portable that is compared to printing out the line using e.g. ``printf`?

Any ideas or hints where I could find some references?
 
