BASH: arithmetic expressions on point values

Asked Nov 03 '20 at 10:33

Active Nov 03 '20 at 10:45

Viewed 16 times

I am looking for bash function suitable to do some simple arithmetic expressions on point values For intance

i=1
let "i_mod=${i}+1"; echo $i_mod
gives me 2
but if
i=1.0
let "i_mod=${i}+0.5";echo $i_mod
gives me an error instead of 1.5

or alternatively one of the sollution that has already been suggested in other topic:

i=1.0
echo "$(($i+1.0))"
-bash: 1.0+1.0: syntax error: invalid arithmetic operator (error token is ".0+1.0")

edited Nov 03 '20 at 10:45

asked Nov 03 '20 at 10:33

user3470313

1

Does this answer your question? How to do integer & float calculations, in bash or other languages/frameworks? – thanasisp Nov 03 '20 at 10:37
not exactly! I've tried one of the sollution proposed for BASH and it did no work ( I edited my post.. – user3470313 Nov 03 '20 at 10:46
The solution you have updated, says "(ksh93/zsh/yash, some bash)", not "bash". But there are many other examples into this post. For example: echo "$i + 1.0" | bc or bc <<< "$i + 1.0" is enough. You can use scale with bc also. You can use awk. etc. In general, the shell is not for arithmetics by its own. – thanasisp Nov 03 '20 at 11:11
I mean "floating point arithmetics" (correction to my last comment) For integers you can just use the bash arithmetic expansion (( )). – thanasisp Nov 03 '20 at 11:22
thank you so much !! l=$(echo "$i + 1.0" | bc) works fine !! – user3470313 Nov 03 '20 at 11:27

0 Answers0