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By default, units shows results to eight significant digits in
general number format. You can change this with the
--exponential, --digits, and --output-format
options. The first sets an exponential format (i.e., scientific
notation) like that used in the original Unix units program,
the second allows you to specify a different number of significant
digits, and the last allows you to control the output appearance using
the format for the printf function in the C programming language.
If you only want to change the number of significant digits or specify
exponential format type, use the --digits and
--exponential options. The --output-format option
affords the greatest control of the output appearance, but requires at
least rudimentary knowledge of the printf format syntax.
See Invoking units, for descriptions of these options.