bc: set number of digits after decimal point
Set the scale
special variable:
$ echo "scale=2; 100/3" | bc
33.33
scale
works only for division; if some geeks need it in multiplication, then you can do achieve this by using string manipulation.
Say if you need to multiply 32 * 0.60
, answer is 19.20
. If you need to get it 19 alone in answer you can get it by different methods.
Using String Manipulation
$ S=$(echo "32*.60" | bc ) ; echo ${S%.*} 19
String Manipulation syntax:
${Variable%pattern}
, this will delete short matching pattern that comes after%
. For more String manipulation details see the Advanced Bash-Scripting Guide.Using
Scale
as stated by**chronitis**
$ echo "scale=0; 32*60/100" | bc 19
To get rid of the trailing 0s, instead of string manipulation, one can also do a divide by 1.
$ echo "0.232 * 1000" | bc 232.000 $ echo "0.232 * 1000 / 1" | bc 232
In addition to previous answers
echo "scale=2; 1.0150876" | bc
Returns
1.0150876
Add Math operations to get only 2 decimal numbers - (NUMBER*100)/100
echo "scale=2; (1.0150876 * 100) / 100" | bc
Now returns
1.01