bash + how to calculate very long numbers in bash?

Question

How to calculate very long numbers in bash?

param=$(( 3247238523785623478565 + 53453453252345346534563412634 ))

echo $param
3420247196502465471

as we see here, this isn't the right answer because of the limit of integer numbers.

[Take your pick](http://unix.stackexchange.com/q/40786/12779) — Marco, May 11 '15 at 16:14
the link above "How do integer & float" does not say anything about long numbers in bash. Most of the answers depend on tools other than bash (not always an option). so this is not a duplicate of that — philwalk, Feb 14 '18 at 21:20

score 14 · Accepted Answer · answered May 11 '15 at 16:14

14

Use bc ("an arbitrary precision calculator language"):

param=$(bc <<< '3247238523785623478565 + 53453453252345346534563412634')

answered May 11 '15 at 16:14

choroba

1 Answers1