How to round floating point numbers in shell?

23 votes

3 answers

93251 views

bash command-line arithmetic floating-point

                          How do I correctly round IEEE 754 floating point numbers on the command line?

I want to specify the precision of the output number - the count of fractional digits.

Rounding 6.66 to precision 1 should give 6.7, for example. More in the table below:

    Value   Precision  Rounded
    6.66    0          7
    6.66    1          6.7
    6.66    2          6.66
    6.66    3          6.660
    6.666   3          6.666
    6.6666  3          6.667

It should be usable in an interactive shell, but ideally robust enough for using it in production shell scripts. 
                        

Asked by Volker Siegel (17703 rep)

Nov 10, 2014, 05:49 AM
Last activity: May 5, 2023, 10:24 AM

How to round floating point numbers in shell?

Related Questions